{"title":"Modwright Separates","description":"","products":[{"product_id":"modwright-ls-100-preamp","title":"Modwright LS 100 Preamp","description":"\u003ch3\u003eModWright LS 100 Tube Preamplifier\u003c\/h3\u003e\u003ch4\u003eSingle-Ended Tube Preamp. More than It Appears. Less Than It Could Cost.\u003c\/h4\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe LS 100 was designed to advance everything that made ModWright's earlier 9.0SE preamplifier well-regarded — sonics, aesthetics, and functionality — while staying at a price point that makes the ModWright house sound genuinely accessible. It is a single-chassis design, internal power supply, compact enough to share shelf space with a matching amplifier, and every inch a ModWright product in the way it is built and the way it sounds.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eIt is also quietly one of the most versatile preamplifiers in the line. A built-in headphone amplifier fed directly from the tube driver stage. An optional phono board — user-installable, no service visit required — that adds MM and MC capability. A Monitor input and tape loop. Home Theater Bypass. Two 12V remote trigger outputs. All of it controlled via pushbutton inputs and a 10-function remote, with no toggle switches anywhere on the front panel.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe LS 100 is the entry point to the ModWright preamplifier line. It does not behave like one.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eThe Circuit — Mu-Stage Design, Zero Feedback, Direct Coupling\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe LS 100 uses a mu-stage — technically a mu-follower or mu-stage variation — as its single gain and buffer circuit. The mu-stage is a topology that has been well-regarded in tube preamplifier design for its combination of excellent linearity, low distortion, and the harmonic richness that characterises the 6SN7 triode when operated correctly. It is a circuit that prioritises natural tone and smooth dynamics over the kind of forced resolution that can make tube amplification sound unnatural.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eTwo 6SN7 driver tubes handle the signal. The 6SN7 is one of the most celebrated dual-triode types in audio — a large, robust tube with a long production history and a wide range of well-regarded NOS options for those who enjoy exploring what tube rolling can do. ModWright recommends the Sophia Electric 6SN7 as an output tube upgrade; for the rectifier, Mullard, Amperex, or Philips GZ34 made in Holland.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eOne 5AR4\/GZ34 rectifier tube (5U4GB and 5V4GB also compatible) feeds a solid-state regulated internal power supply. The supply is internal to the main chassis — no separate power supply box — keeping the LS 100 compact without the penalty of inadequate power delivery. Star grounding and optimised layout are employed throughout to minimise the noise floor.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eZero global negative feedback. Direct-coupled input with a single ModWright custom coupling capacitor at the output for the cleanest signal path. Pure copper PCB traces. Extremely short signal paths and high-quality audio-grade components throughout. The 300-ohm output impedance is low enough to drive virtually any power amplifier without interaction — tube or solid-state.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe LS 100 is phase-inverting by design, consistent with the single-stage topology. This is noted in the owner's manual and easily accommodated by reversing speaker leads at the amplifier or speaker terminals.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eBuilt-In Headphone Amplifier\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe headphone amplifier in the LS 100 is not an afterthought. It is a Class A discrete solid-state unity-gain circuit that acts as an impedance-matching stage between the tube driver stage and the headphone output — allowing the 6SN7 stage to drive headphones directly, without an additional gain stage in the signal path. The result is headphone amplification that shares the tonal character of the tube preamp stage itself. Rated at 1.5 watts into loads from 32 to 600 ohms, it is capable of driving a wide range of headphones with authority.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eOptional Phono Stage\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe phono board is available as a user-installable upgrade via two 20-pin headers and sockets — no soldering, no service required. It adds MM and MC phono capability to the LS 100 without an external box or additional cabling.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe phono circuit uses a tube-JFET input stage followed by tube gain and buffer stages, with a 12AX7 (MC) and 12AU7 (MM) tube complement. Passive RIAA filtering. Internal dip switches for cartridge loading at 50, 100, 500, 1K, and 47K ohms, plus 100pF capacitive loading. Total preamp and phono gain is 66dB, variable via the volume control.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eNote: the phono slot accepts either the phono board or an optional DAC board — not both simultaneously.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eConnectivity and Control\u003c\/h3\u003e\u003cul\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e5× RCA line inputs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× XLR line input (wired single-ended)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× RCA Home Theater Bypass input\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× RCA Monitor input\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2× RCA main outputs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× XLR main output (wired single-ended)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× RCA tape output\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2× 12V remote trigger outputs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eHeadphone output (front panel)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eSelectable balance control (bypassable for cleaner signal path)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e10-function remote: power, volume, mute, input select, monitor input, trigger outputs, balance\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe balance control is selectable — it can be left in circuit for fine-tuning, or bypassed entirely for the shortest possible signal path. This kind of considered flexibility is characteristic of the LS 100's design throughout.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003ePress Recognition\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003ePositive Feedback — Best of the Best\u003c\/strong\u003e Bob Levi \u003ca href=\"http:\/\/www.positive-feedback.com\/Issue52\/rmaf2.htm\"\u003eRead the review\u003c\/a\u003e\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eAudiophilia — December 2011\u003c\/strong\u003e Reviewed alongside the KWA 100SE amplifier. \u003ca href=\"http:\/\/www.audiophilia.com\/wp\/?p=6990\"\u003eRead the review\u003c\/a\u003e\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003e6moons\u003c\/strong\u003e\u003ca href=\"http:\/\/www.6moons.com\/audioreviews\/modwright7\/1.html\"\u003eRead the review\u003c\/a\u003e\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cdiv\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eGain\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e11dB (linestage); 66dB total with phono\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eInput Impedance\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e38K ohm\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOutput Impedance\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e300 ohm\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e20Hz – 100kHz (+\/-1dB)\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eMax Input Signal\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e10 Vrms\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eMax Output Signal\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e37 Vrms\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eDriver Tubes\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e2× 6SN7\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eRectifier Tube\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e1× 5AR4 \/ GZ34 (5U4GB, 5V4GB compatible)\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eLine Inputs\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e5× RCA; 1× XLR (wired single-ended)\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eMain Outputs\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e2× RCA; 1× XLR (wired single-ended)\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eAdditional I\/O\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e1× RCA HT Bypass; 1× RCA Monitor input; 1× RCA tape output\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eTrigger Outputs\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e2× 12V remote\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eHeadphone Output\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eYes — Class A discrete, 1.5W into 32–600 ohm\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePhono Option\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eUser-installable; MM\/MC; 12AX7 + 12AU7; passive RIAA; dip-switch loading\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOperation\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eZero global negative feedback; phase inverting\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eInternal; tube rectified, solid-state regulated\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e17.75″W × 17.5″D × 6.5″H\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e25 lbs \/ 31 lbs shipped\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eFinish\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eSilver or black\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eHand-crafted in the USA\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003chr\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eQuestions about how the LS 100 compares to the LS 99, or whether the phono option is right for your cartridge? We're happy to help you think it through.\u003c\/p\u003e","brand":"Modwright","offers":[{"title":"Silver \/ yes","offer_id":40794724335683,"sku":"Silver-yes","price":5000.0,"currency_code":"USD","in_stock":true},{"title":"Silver \/ no","offer_id":40794724368451,"sku":"Silver-no","price":5000.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ yes","offer_id":40794724401219,"sku":"Black-yes","price":5000.0,"currency_code":"USD","in_stock":true},{"title":"Black \/ no","offer_id":40794724433987,"sku":"Black-no","price":5000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0572\/0522\/7587\/products\/Modwright-LS-100-Preamp-Tweek-Geek-23898287800387.jpg?v=1779252884"},{"product_id":"ls-300-balanced-tube-preamplifier","title":"Modwright LS 300 Balanced Tube Preamplifier","description":"\u003ch3\u003eModWright LS 300 Balanced Tube Preamplifier\u003c\/h3\u003e\u003ch4\u003eModWright's Reference. The Standard Everything Else Is Measured Against.\u003c\/h4\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe LS 300 is the preamplifier that defines what ModWright considers possible. It is the fully resolved expression of Dan Wright's approach to balanced tube preamplifier design — dual mono construction, transformer-coupled inputs, tube rectification feeding separately regulated per-channel power supplies, and a fully differential signal path from input to output. Nothing is shared between channels that doesn't have to be.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWhen ModWright designed the LS 99, they started here. The LS 300's transformer-coupled input and output topology, its tube rectification architecture, and its 6922 driver circuit all passed directly into the smaller design. The LS 99 exists because the LS 300 proved what the topology was capable of. The LS 300 exists because Dan Wright wanted to know how far that topology could go without constraint.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThis is the answer.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eThe Architecture — Dual Mono, Fully Balanced, Transformer Coupled\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eDual mono design means exactly what it says: each channel has its own power supply regulation, its own rectifier tube, its own driver tube, its own signal path. The two channels share a chassis and an outboard power supply enclosure, but from a circuit standpoint they are independent amplifiers operating in parallel. The result is channel separation that a shared-rail design cannot match, and a soundstage stability that reflects it.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe outboard power supply connects via two separate 4-foot umbilicals — one per channel — with 8-pin Switchcraft connectors. Removing the power supply transformers from the main chassis eliminates a significant source of magnetic interference in proximity to the signal stages. The dual umbilical arrangement maintains the channel independence of the dual mono topology all the way back to the power source.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eAll three RCA inputs are converted to fully balanced differential signals via Lundahl signal transformers before entering the amplification stage. This means the LS 300 operates as a fully balanced preamplifier regardless of whether the connected source provides a balanced output — unbalanced sources receive the same transformer-coupled, differential treatment as balanced ones. The Lundahl transformers also provide galvanic isolation between source and preamplifier, rejecting ground-loop noise and common-mode interference at the point of entry.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe two 6922 driver tubes handle the signal in pure Class A operation throughout. Tube rectification via a pair of 5R4GY tubes feeds the power supply, with solid-state regulation maintaining precision and stability from there. The combination delivers the natural current character of tube rectification with the controlled, consistent output that regulated supplies provide.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eZero global negative feedback. The LS 300 does not use a corrective loop. The circuit performs on its own terms, without the phase artifacts and transient smearing that feedback can introduce.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eThe Design Goal — and What It Sounds Like\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eDan Wright's stated goal for the LS 300 was to deliver the beauty of tubes while maintaining a neutral sonic signature. That is a more demanding brief than it may appear. It rules out the kind of euphonic coloration that makes some tube preamplifiers pleasant but imprecise. It demands dimensionality and harmonic naturalness alongside tonal accuracy and bass control.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe -115dB noise floor — 5dB quieter than the LS 99 — creates the kind of silence around the music that allows the quietest details in a recording to be fully audible. What fills that space is a presentation with genuine three-dimensional depth, stable and precisely located imaging, and the tonal rightness that the best tube designs achieve without exaggerating warmth or adding softness where the music doesn't have it.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe frequency response — flat to 100kHz — means the LS 300 is not shaping anything at the extremes. Bass is controlled and defined. Highs are refined without being etched. The design goal comes through in the result: a preamplifier with the dimensionality and presence of tubes, and the accuracy and authority of a reference design.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eConnectivity and Control\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe LS 300 is equipped for the most demanding balanced systems while remaining fully accommodating of unbalanced sources.\u003c\/p\u003e\u003cul\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2× XLR fully balanced inputs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e3× RCA inputs (all Lundahl transformer coupled to balanced differential)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× RCA input doubles as Home Theater Bypass\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2× XLR fully balanced main outputs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2× RCA single-ended main outputs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eFront panel: input select, power, mute, HT\/BP, phase\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eRemote: volume, mute, power, phase invert\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eTube complement: 2× 6922 \/ 6DJ8 \/ 7308 drivers; 2× 5R4GY rectifiers (5AR4, GZ34, 5U4GB, 5V4GB, 274B compatible)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe front-panel phase invert — controllable via remote — allows the LS 300 to correct absolute phase at the preamplifier stage, a refinement that affects imaging stability and is audible on well-recorded material.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eWhere the LS 300 Fits\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe LS 300 is the natural preamplifier for a reference-level ModWright system — paired with the KWA 99 Monoblocks for a fully balanced separates stack, or integrated into a larger system alongside the PH 150 phono stage. Its aesthetics are shared with both the PH 150 and KWA 150SE, reflecting a deliberate design language across ModWright's reference tier.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eFor listeners who have heard what the LS 99 offers and want to know what the reference topology sounds like without the constraints of the smaller chassis and single power supply — this is that preamplifier.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cdiv\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eGain\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e11dB\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e20Hz – 100kHz (-1dB at 100kHz)\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eInput Impedance\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e20K ohm\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOutput Impedance\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e100 ohm\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eNoise Floor\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e-115dB\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eTHD\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e\u0026lt; 0.03% @ 1kHz\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eDriver Tubes\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e2× 6922 \/ 6DJ8 \/ 7308\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eRectifier Tubes\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e2× 5R4GY (5AR4, GZ34, 5U4GB, 5V4GB, 274B compatible)\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eInputs\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e2× XLR balanced; 3× RCA (Lundahl transformer coupled); 1× RCA HT Bypass\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOutputs\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e2× XLR balanced; 2× RCA single-ended\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOperation\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003ePure Class A, fully balanced, zero negative feedback\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eExternal outboard, dual umbilical, per-channel regulation\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eUmbilicals\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e2× 4 ft., 8-pin Switchcraft connectors\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePreamp Dimensions\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e17″W × 8″H × 12.5″D (height varies with rectifier tube)\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePSU Dimensions\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e8″W × 4.5″H × 10″D\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePreamp Weight\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e30 lbs\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePSU Weight\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e17 lbs\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eHand-crafted in the USA\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003chr\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eQuestions about how the LS 300 compares to the LS 99, or how it fits into your system? We're happy to help you think it through.\u003c\/p\u003e","brand":"Modwright","offers":[{"title":"Default Title","offer_id":40794800095299,"sku":null,"price":11000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0572\/0522\/7587\/files\/Modwright-LS-300-Balanced-Tube-Preamplifier-Tweek-Geek-27444847640643.png?v=1779252712"},{"product_id":"modwright-kwa-99-mono-amplifiers","title":"Modwright KWA 99 Mono Amplifiers","description":"\u003ch3\u003eModWright KWA 99 Monoblock Amplifiers\u003c\/h3\u003e\u003ch4\u003e100 Watts. Maximum Class A Bias. Zero Compromise on What Matters.\u003c\/h4\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eDan Wright's brief for the KWA 99 was specific: a 100-watt MOSFET amplifier, biased as far into Class A as heat rejection and efficiency would allow, in a compact monoblock chassis that fits cleanly into a real listening room. Not an oversized statement piece. Not a pure Class A design that runs hot enough to heat the room. A practical, precisely engineered amplifier that prioritises sound above all else — and then gets out of its own way.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe result is an amplifier that doesn't announce itself. It simply reveals what your system, and your speakers, are actually capable of.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWe've run the KWA 99s with the Steinmusic Bobby S Ultimate and the Aurai Z165 — speakers we know well, in rooms we know well. What they did to the bass in both cases was not subtle. We turned the subwoofers off. We didn't need them. What came back was deep, fast, articulate, and tuneful — bass we hadn't heard from either speaker before. No other amplifier has done that in our room.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThat's the clearest measure of what a great amplifier actually does: it doesn't add character. It removes the ceiling.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eThe Design — What Dan Built and Why\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe monoblock configuration was a deliberate choice, consistent with the compact '9' series philosophy that runs across the PH 9.0\/X\/T, Analog Bridge, and LS 99. One chassis per channel means a fully independent power supply for each amplifier, shorter internal signal paths, and complete channel separation from input to output — without the physical footprint of traditional monoblock designs.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eExicon Lateral MOSFETs are the output device of choice. Lateral MOSFETs have long been associated with a particular quality in audio amplification: they run cooler, age more gracefully, and have a current delivery characteristic that some engineers consider more similar to tubes than conventional bipolar transistors. They're not inexpensive, and they're not universal — but they're the right choice for an amplifier designed around sound quality and long-term reliability.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eBoth RCA and XLR inputs are transformer coupled to the input stage with a floated ground — the same topology that defines the LS 99 preamp. Transformer coupling at the input eliminates ground loop noise, rejects common-mode interference, and ensures the amplifier's input stage is operating with the cleanest possible signal regardless of what's upstream.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eZero global feedback. The KWA 99 does not use feedback to correct errors in the output stage. Whatever the amplifier does, it does without a corrective loop — which places the full burden on the quality of the circuit itself, and removes the phase and transient artifacts that feedback can introduce.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eClass A\/B operation with high Class A bias. The amplifier operates in Class A for the majority of its output range, crossing into Class B only at higher output levels where the thermal and efficiency trade-offs of pure Class A become impractical. The result is the linearity and naturalness of Class A where it matters most, without the heat and inefficiency that would make the amplifier difficult to live with.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eThe Listening Experience\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe midrange is where the KWA 99 earns its reputation. There is purity here, and dimension, and the kind of musical ease that comes from an amplifier that isn't working hard. Tonal accuracy is excellent — instruments have body and presence without added warmth or coloration. Trailing decays extend naturally into silence. The background is quiet.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe high frequencies are refined and neutral. There is air and space in the upper register, but no edge, no splashiness, nothing that draws attention to itself. Extended but not bright. Present but not forward.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eAt the frequency extremes, the KWA 99 delivers control rather than spectacle. Bass is not emphasized — it is reproduced with the precision and grip that allows a well-designed speaker to show what it's capable of. At lower listening levels, the high Class A bias means the amplifier maintains its composure and linearity, which is where many designs at this power rating begin to fall apart.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe KWA 99s represent a new level of performance in ModWright's amplifier line. For a company with ModWright's history, that is not a phrase used lightly.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eConnectivity and Control\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eEach monoblock is identically equipped:\u003c\/p\u003e\u003cul\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× RCA input (transformer coupled)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× XLR balanced input (transformer coupled)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1 pair 5-way binding posts (positive red, negative black; not bridged)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× 12V trigger input for system integration\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eAnalog VU meter with adjustable brightness dimmer (bright, dim, or off)\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eInternal LED on\/off toggle\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe 12V trigger integrates directly with the LS 99 preamp, allowing both amplifiers to power on and off with the preamplifier — a practical detail that matters in daily use.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe amber-illuminated VU meters are not merely aesthetic. They are a functional indicator of output level and a deliberate design choice by Dan Wright — a nod to vintage instrumentation that reflects the amplifier's character: technically modern, but with a warmth and intentionality that connects to the tradition of great amplifier design.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eWhere the KWA 99 Fits\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe KWA 99 Monoblocks are the natural amplification endpoint of a ModWright-based system. Paired with the LS 99 preamp, the two components share transformer-coupled input topology, 12V trigger integration, and a unified design philosophy — a genuinely cohesive balanced stack, not a mix of separately designed pieces.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eFor systems built around other preamplifiers, the KWA 99s are equally capable partners. The 47K ohm input impedance is accommodating, the balanced input is fully differential, and the gain of 26dB suits the output levels of most modern sources and preamplifiers.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eIf the speakers you own have been waiting for an amplifier that can show you what they're truly capable of, the KWA 99 is a strong candidate for the one that finally does it.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003ePress Recognition\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eTwittering Machines — Favorite Amplifier, June 2024\u003c\/strong\u003e Michael Lavorgna reviewed the KWA 99 Monoblocks alongside the LS 99 preamp as a complete ModWright balanced stack. \u003ca href=\"https:\/\/twitteringmachines.com\/review-a-modwright-stack-ls-99-balanced-tube-preamp-kwa-99-monoblocks\/\"\u003eRead the review\u003c\/a\u003e\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cdiv\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePower Output\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e100W @ 8 ohms; 200W @ 4 ohms\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eGain\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e26dB\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e10Hz – 150kHz (+0, -1dB)\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eInput Impedance\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e47K ohm\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eNoise Floor\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e-90dB (unweighted)\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eTHD\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e\u0026lt; 0.05%\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eInputs\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e1× RCA; 1× XLR balanced (both transformer coupled)\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOutputs\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e1 pair 5-way binding posts per amp\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eTrigger\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e1× 12V input per amp\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOperation\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eClass A\/B, high Class A bias; zero global feedback\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOutput Devices\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eExicon Lateral MOSFETs\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eDimensions (each)\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e10.5″W × 6.5″H × 16″D\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eWeight (each)\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e30 lbs \/ 35 lbs shipped\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eSold As\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003ePair\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eHand-crafted in the USA\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003chr\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eQuestions about how the KWA 99s pair with your speakers or fit into your system? We're happy to help you think it through.\u003c\/p\u003e","brand":"Modwright","offers":[{"title":"Default Title","offer_id":40794910359619,"sku":null,"price":9000.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0572\/0522\/7587\/products\/Modwright-KWA-99-Mono-Amplifiers-Tweek-Geek-23899254292547.jpg?v=1779252530"},{"product_id":"modwright-ls-99","title":"Modwright LS 99","description":"\u003ch3\u003eModWright LS 99 Balanced Tube Preamplifier\u003c\/h3\u003e\u003ch4\u003eReference Lineage. Refined Into Something You'll Actually Live With.\u003c\/h4\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eModWright didn't design the LS 99 by working up from a budget. They designed it by working down from the top — taking the topology, the transformer architecture, and the core circuit philosophy of the LS 300 Reference flagship and asking what could be simplified without surrendering what matters.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe answer, in Dan Wright's own words: 95% of the sonics at nearly $5,000 less. That's not marketing language. It's a candid acknowledgment from the designer that the LS 99 competes in the same conversation as his reference product — and that he's quite pleased with the result.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWe are too. The LS 99 is the kind of piece that makes you reconsider what a preamplifier at this price is supposed to sound like.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eThe Design — What the LS 300 Gave It\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe LS 99 shares the LS 300's transformer coupled input and output topology — a design choice that shapes the character of the amplification more than almost anything else in the signal path. Transformers at both the input and output stage mean the LS 99 doesn't behave like a typical tube preamp. The coupling is tighter, the noise floor is lower, and the sound has the kind of dimensional stability that's difficult to achieve with capacitor-coupled designs.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eTube rectification — via a 5AR4\/GZ34 — feeds a solid-state regulated power supply. It's a hybrid approach that combines the natural current delivery of tube rectification with the precision and consistency of solid-state regulation. The result is a power supply that's both musically natural and electrically controlled: the best of both architectures working in their respective areas of strength.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eTwo 6922 driver tubes handle the signal. The 6922 — and its equivalents, the 6DJ8, 7308, and E88CC — is one of the most celebrated small-signal tubes in audio, with a wide variety of well-regarded production options and a long history in high-end preamp design. It's an ideal choice for a design prioritizing resolution and tonal accuracy, and it's a tube with a robust market of NOS and current-production alternatives for those who enjoy the rolling process.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe power supply is outboard — housed in a separate chassis connected via a 4-foot umbilical with Switchcraft 8-pin connectors — but unlike the LS 300, it is not dual mono. That's the primary architectural concession the LS 99 makes relative to the flagship, and it's the honest explanation for most of the price difference. The core circuit remains fully faithful to the reference design.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eThe Listening Experience\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eTransformer-coupled tube preamps have a recognisable quality when they're done well: a stability of image, a naturalness of timbre, and a sense of three-dimensional space around instruments that capacitor-coupled designs rarely match. The LS 99 has all of that, and it has it with a noise floor — -110dB unweighted — that gives the quietest passages in a recording room to breathe.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe 11dB of gain is measured and appropriate for most amplifier pairings. The 100-ohm output impedance is low enough to drive virtually any power amplifier without interaction. The frequency response — 20Hz to 150kHz, flat — means the LS 99 is not doing anything to the music at the frequency extremes. What you hear is what the recording contains.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003ePure Class A operation throughout. No switching, no compromise in the output stage.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eConnectivity and Control\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe LS 99 is fully equipped for balanced and unbalanced systems alike.\u003c\/p\u003e\u003cul\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2× XLR fully balanced inputs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e3× RCA inputs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e1× RCA Home Theater Bypass input\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2× XLR fully balanced outputs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003e2× RCA outputs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eDual remote 12V trigger outputs\u003c\/li\u003e\n\u003cli class=\"font-claude-response-body whitespace-normal break-words pl-2\"\u003eRemote control: volume, mute, and trigger outputs\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe Home Theater Bypass input allows the LS 99 to be integrated into a home theater system without disrupting the two-channel signal path — a thoughtful inclusion that reflects how real systems are actually used.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eWhere the LS 99 Fits\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eThe LS 99 is the natural preamplifier for a ModWright-based system, and it pairs with equal authority in broader contexts. Pair it with the KWA 99 Monoblocks for a complete ModWright balanced stack. Add the PH 9.0XT phono stage and the Analog Bridge for a full analog front end that benefits from consistent design philosophy throughout.\u003c\/p\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eIt is also a compelling standalone upgrade in systems where the preamp has been the limiting factor — where amplification and sources are strong, but the center of the system hasn't kept up. The LS 99's output impedance, gain structure, and noise floor are well-suited to a wide range of pairings.\u003c\/p\u003e\u003chr\u003e\u003ch3\u003ePress Recognition\u003c\/h3\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003e\u003cstrong\u003eTwittering Machines — June 2024\u003c\/strong\u003e Michael Lavorgna reviewed the LS 99 alongside the KWA 99 Monoblocks as a complete ModWright balanced stack. \u003ca href=\"https:\/\/twitteringmachines.com\/review-a-modwright-stack-ls-99-balanced-tube-preamp-kwa-99-monoblocks\/\"\u003eRead the review\u003c\/a\u003e\u003c\/p\u003e\u003chr\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cdiv\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eGain\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e11dB\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e20Hz – 150kHz, flat\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eInput Impedance\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e30K ohm\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOutput Impedance\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e100 ohm\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eNoise Floor\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e-110dB (unweighted)\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eDriver Tubes\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e2× 6922 \/ 6DJ8 \/ 7308 \/ E88CC\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eRectifier Tube\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e5AR4 \/ GZ34 and equivalents\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eInputs\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e2× XLR balanced; 3× RCA; 1× RCA HT Bypass\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOutputs\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e2× XLR balanced; 2× RCA\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eTrigger Outputs\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eDual remote 12V\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOperation\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003ePure Class A\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePower Supply\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eExternal outboard, tube rectified \/ SS regulated\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eUmbilical\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e4 ft., 8-pin Switchcraft connectors\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePreamp Dimensions\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e10.5″W × 4.5″H × 12″D\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePSU Dimensions\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e7″W × 3″H × 9″D\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePreamp Weight\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e17 lbs\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003ePSU Weight\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e11 lbs\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eCombined Shipping Weight\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e33 lbs\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cstrong\u003eOrigin\u003c\/strong\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003eHand-crafted in the USA\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003chr\u003e\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eQuestions about how the LS 99 fits into your system, or how it compares to the LS 300? We're happy to help you think it through.\u003c\/p\u003e","brand":"Modwright","offers":[{"title":"Black","offer_id":40794917601347,"sku":null,"price":6500.0,"currency_code":"USD","in_stock":true},{"title":"Silver","offer_id":40794917634115,"sku":null,"price":6500.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0572\/0522\/7587\/products\/Modwright-LS-99-Tweek-Geek-23899305148483.jpg?v=1779252514"}],"url":"https:\/\/tweekgeek.com\/collections\/modwright-separates.oembed","provider":"Tweek Geek","version":"1.0","type":"link"}