{"title":"Locomotive Audio","description":null,"products":[{"product_id":"locomotive-audio-model-14b","title":"Locomotive Audio Model 14B","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eLocomotive Audio Model 14B\u003c\/strong\u003e is a single-channel vari-mu tube compressor\/limiter in its own 2U rack chassis, designed by Eric Strouth as a hybrid of three classic circuits: an input stage close to the Universal Audio 175B\/176 (with a slower attack), an output stage related to the Gates Sta-Level\/RCA BA-6A, and influence from the Collins 26U. It's one of two standalone (non-500-series) compressors in the Locomotive Audio range, alongside the WT-Comp.\u003c\/p\u003e\n\u003ch3\u003eTwo operating modes instead of one fixed ratio\u003c\/h3\u003e\n\u003cp\u003eA compress\/limit switch changes the gain-reduction character from 4:1 in compress mode to 10:1 in limit mode, and disabling compression turns the unit into a pure tube line amplifier. Attack sweeps continuously from 300 microseconds to 20ms, release from 100ms to 2 seconds, covering everything from very fast transient catching to slow, musical dynamics leveling.\u003c\/p\u003e\n\u003ch3\u003eSidechain filter and stereo-link built in\u003c\/h3\u003e\n\u003cp\u003eAn adjustable sidechain high-pass filter (off, or continuously variable roughly 70-350Hz) keeps the compressor from reacting to the lowest frequencies, and a TRS stereo-link jack ties two 14B units together as a matched pair on a mix bus. Cinemag input and interstage transformers, plus a custom output transformer, round out a tube signal path built on a 6BC8, a 12AY7 and two 6V6 tubes in a push-pull output stage. The option to disable compression and run the 14B as a pure line amplifier adds flexibility for moments in a session where only the tube colour matters, not dynamics control.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSingle-channel vari-mu tube compressor\/limiter\u003c\/li\u003e\n\u003cli\u003eCompress (4:1) \/ limit (10:1) switch\u003c\/li\u003e\n\u003cli\u003eAdjustable sidechain high-pass filter\u003c\/li\u003e\n\u003cli\u003eTRS jack for stereo-linking two units\u003c\/li\u003e\n\u003cli\u003eCompression-off mode — pure tube line amplifier\u003c\/li\u003e\n\u003cli\u003eHardwire bypass\u003c\/li\u003e\n\u003cli\u003eVU meter: gain reduction \/ output level\u003c\/li\u003e\n\u003cli\u003eDesigned by Eric Strouth, built in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: single-channel vari-mu tube compressor\u003c\/li\u003e\n\u003cli\u003eTubes: 6BC8, 12AY7, 2x 6V6 (push-pull)\u003c\/li\u003e\n\u003cli\u003eTransformers: Cinemag input and interstage, custom output\u003c\/li\u003e\n\u003cli\u003eRatio: 4:1 (compress) \/ 10:1 (limit)\u003c\/li\u003e\n\u003cli\u003eAttack: 300µs – 20ms\u003c\/li\u003e\n\u003cli\u003eRelease: 100ms – 2 seconds\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20Hz – 20kHz\u003c\/li\u003e\n\u003cli\u003eTHD+N: \u0026lt;1%, S\/N: \u0026gt;70dB\u003c\/li\u003e\n\u003cli\u003eDimensions: 482 x 89 x 254mm (2U)\u003c\/li\u003e\n\u003cli\u003ePower: 42W, 120\/240V AC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Locomotive Audio","offers":[{"title":"Default Title","offer_id":54961111105873,"sku":"61015","price":2599.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/Locomotive_Audio_Model_14B_1.jpg?v=1789721096"},{"product_id":"locomotive-audio-model-86b-2","title":"Locomotive Audio Model 86B-2","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eLocomotive Audio Model 86B-2\u003c\/strong\u003e is a two-channel tube mic\/line preamp in its own 2U rack chassis, a modernized take on the preamp from the mid-1950s Ampex 601 suitcase tape recorder. Each of its two channels is an independent circuit built on an EF86 input tube and a 12AY7 output tube, delivering up to 75dB of gain. It's the two-channel counterpart to the single-channel 86B-1 module from the same Locomotive preamp family.\u003c\/p\u003e\n\u003ch3\u003eTwo full channels, not one preamp with a splitter\u003c\/h3\u003e\n\u003cp\u003eThe 86B-2 succeeds Locomotive's earlier 286A from 2014, adding separate mic and line XLR inputs per channel plus a higher-impedance DI than its predecessor. MuMetal-shielded input transformers and nickel-and-steel output transformers, both wound in-house, finish the signal path ahead of the output XLR.\u003c\/p\u003e\n\u003ch3\u003eControl at every stage of the signal\u003c\/h3\u003e\n\u003cp\u003eEach channel has a switchable mic input impedance (500Ω or 1.8kΩ), a -20dB pad, a 100Hz high-pass filter, 48V phantom power with a polarity switch, and a 3-colour LED output meter (green above -10dBu, orange above +10dBu, red above +18dBu) for a quick level check without looking at the DAW. Two independent channels in one chassis make it easier to track stereo pairs, drum overheads or a vocal duet, without linking two separate units with a stereo-link cable.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2-channel tube mic\/line\/DI preamp\u003c\/li\u003e\n\u003cli\u003eEF86 (input) and 12AY7 (output) tubes per channel\u003c\/li\u003e\n\u003cli\u003eModernized Ampex 601 design, successor to the 286A\u003c\/li\u003e\n\u003cli\u003eSwitchable mic input impedance: 500Ω \/ 1.8kΩ\u003c\/li\u003e\n\u003cli\u003e-20dB pad and 100Hz high-pass filter\u003c\/li\u003e\n\u003cli\u003e48V phantom power with polarity switch\u003c\/li\u003e\n\u003cli\u003e3-colour LED output meter\u003c\/li\u003e\n\u003cli\u003eHand-built in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: 2-channel tube preamp\u003c\/li\u003e\n\u003cli\u003eTubes: EF86 + 12AY7 per channel\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 75dB\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20Hz – 20kHz\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +24dBu\u003c\/li\u003e\n\u003cli\u003eImpedance: line input 10kΩ, DI 1.6MΩ, output 300Ω\u003c\/li\u003e\n\u003cli\u003eTHD+N: \u0026lt;1%, S\/N: \u0026gt;70dB\u003c\/li\u003e\n\u003cli\u003eDimensions: 482 x 89 x 254mm (2U)\u003c\/li\u003e\n\u003cli\u003ePower: 25W, 115\/230V AC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Locomotive Audio","offers":[{"title":"Default Title","offer_id":54961111466321,"sku":"61014","price":2399.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/Locomotive_Audio_Model_86B-2_1.jpg?v=1789721106"},{"product_id":"locomotive-audio-copperline","title":"Locomotive Audio Copperline","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eLocomotive Audio Copperline\u003c\/strong\u003e isn't a preamp or a compressor, it's a two-channel signal-conditioning tool that sits between a microphone and a preamp, or between two line-level devices. Instead of amplifying or colouring the sound, it manages phantom voltage, level, filtering and polarity before the signal moves further down the chain. It's the only device of this type in the Locomotive Audio catalogue, the rest of the brand's range is preamps, compressors and DI boxes.\u003c\/p\u003e\n\u003ch3\u003eAdjustable phantom power instead of a fixed +48V\u003c\/h3\u003e\n\u003cp\u003eA patent-pending phantom power source, adjustable up to 52V, ramps up over 5 seconds on turn-on, protecting older, delicate ribbon and tube microphone transformers from a voltage spike at startup. For microphones that want something other than standard phantom, that's a function a typical single-voltage preamp doesn't offer.\u003c\/p\u003e\n\u003ch3\u003eAn attenuator, a filter and a vintage load in one module\u003c\/h3\u003e\n\u003cp\u003eA 5-position attenuator (Unity, 15, 20, 30, 40dB) and a 5-position high-pass filter (off, 45, 75, 150, 300Hz) on a mu-metal shielded inductor give control over level and low-end content before the preamp even sees the signal. A polarity switch, a mute that works independently of every other setting, and a \"Vintage Ω\" load, an 825Ω resistor switched across XLR pins 2 and 3, simulate the low-impedance input of older gear. It's particularly useful when working with older ribbon or tube microphones that are sensitive to standard +48V, or when building a custom signal chain ahead of a specific preamp.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2-channel mic\/line signal-conditioning module\u003c\/li\u003e\n\u003cli\u003eAdjustable phantom power up to 52V, 5-second ramp (patent pending)\u003c\/li\u003e\n\u003cli\u003e5-position attenuator: Unity \/ 15 \/ 20 \/ 30 \/ 40dB\u003c\/li\u003e\n\u003cli\u003e5-position high-pass filter: off \/ 45 \/ 75 \/ 150 \/ 300Hz\u003c\/li\u003e\n\u003cli\u003ePolarity switch and independent mute\u003c\/li\u003e\n\u003cli\u003e\"Vintage Ω\" load (825Ω across XLR pins 2\/3)\u003c\/li\u003e\n\u003cli\u003eMu-metal shielded inductor in the filter path\u003c\/li\u003e\n\u003cli\u003eHand-built in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: 2-channel mic\/line conditioning module\u003c\/li\u003e\n\u003cli\u003ePhantom power: adjustable, up to 52V, 5-second ramp\u003c\/li\u003e\n\u003cli\u003eAttenuator: Unity \/ 15 \/ 20 \/ 30 \/ 40dB\u003c\/li\u003e\n\u003cli\u003eInput impedance at 15-40dB: 1200-1500Ω\u003c\/li\u003e\n\u003cli\u003eHigh-pass filter: off \/ 45 \/ 75 \/ 150 \/ 300Hz\u003c\/li\u003e\n\u003cli\u003e\"Vintage Ω\" load: 825Ω (XLR pins 2\/3)\u003c\/li\u003e\n\u003cli\u003eConnectors: XLR in\/out per channel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Locomotive Audio","offers":[{"title":"Default Title","offer_id":54961112023377,"sku":"61006","price":799.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/Locomotive_Audio_Copperline_1.jpg?v=1789721092"},{"product_id":"locomotive-audio-model-86b-1","title":"Locomotive Audio Model 86B-1","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eLocomotive Audio Model 86B-1\u003c\/strong\u003e is a single-channel version of the 86B-2 circuit in a 500-series module, built on the same modernized Ampex 601 tape-recorder preamp philosophy. Unlike its two-channel sibling, its input stage runs a 6BR7 tube instead of an EF86, paired with the same 12AY7 output tube and the same 75dB maximum gain. It's the single-channel counterpart to the two-channel 86B-2, built for a 500-series slot instead of its own rack chassis.\u003c\/p\u003e\n\u003ch3\u003eSame family, different input tube\u003c\/h3\u003e\n\u003cp\u003eThe 6BR7 and the EF86 are functionally similar remote-cutoff pentodes, but they're different tube types, so the 86B-1 isn't a literal copy of one 86B-2 channel, it's a separate take on the same Ampex 601\/286A lineage, adapted to the 500-series format. MuMetal-shielded input transformers and nickel-and-steel output transformers, both wound in-house, stay common across Locomotive's whole preamp family.\u003c\/p\u003e\n\u003ch3\u003eFull control in a single 500-series slot\u003c\/h3\u003e\n\u003cp\u003eA two-knob gain\/level layout, a -20dB pad, an 85Hz high-pass filter, switchable mic input impedance, a high-impedance front-panel DI input, 48V phantom power with a polarity switch, and a 3-colour LED meter pack the full feature set of a larger rackmount preamp into one 500-series module. The 500-series format packs the same level of control as the larger 86B-2 into a single rack slot, saving space where channel density per rack unit matters most.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSingle-channel tube preamp in 500-series format\u003c\/li\u003e\n\u003cli\u003e6BR7 input tube, 12AY7 output tube\u003c\/li\u003e\n\u003cli\u003eSame design lineage as the 86B-2, different format and input tube\u003c\/li\u003e\n\u003cli\u003eSwitchable mic input impedance\u003c\/li\u003e\n\u003cli\u003e-20dB pad and 85Hz high-pass filter\u003c\/li\u003e\n\u003cli\u003eHigh-impedance front-panel DI input\u003c\/li\u003e\n\u003cli\u003e48V phantom power with polarity switch\u003c\/li\u003e\n\u003cli\u003e3-colour LED output meter\u003c\/li\u003e\n\u003cli\u003eHand-built in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: single-channel tube preamp, 500-series\u003c\/li\u003e\n\u003cli\u003eTubes: 6BR7 (input), 12AY7 (output)\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 75dB\u003c\/li\u003e\n\u003cli\u003eTransformers: MuMetal input, nickel-and-steel output, in-house wound\u003c\/li\u003e\n\u003cli\u003ePad: -20dB\u003c\/li\u003e\n\u003cli\u003eHigh-pass filter: 85Hz\u003c\/li\u003e\n\u003cli\u003ePower: 48V phantom\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Locomotive Audio","offers":[{"title":"Default Title","offer_id":54961112056145,"sku":"61012","price":999.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/Locomotive_Audio_Model_86B-1_1.jpg?v=1789721102"},{"product_id":"locomotive-audio-z-car","title":"Locomotive Audio Z-Car","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eLocomotive Audio Z-Car\u003c\/strong\u003e is a passive DI and re-amp box with no power of its own, the whole signal path runs through a custom mu-metal shielded transformer, with no active electronics involved. In DI mode it turns an instrument signal into something a mic preamp can take; in Amp-Up mode it does the reverse, taking a line-level signal recorded in the DAW and stepping it up to instrument level, ready to drive pedals or a guitar amp for re-amping. It's one of two signal-conditioning devices in the Locomotive Audio range, alongside the Copperline module.\u003c\/p\u003e\n\u003ch3\u003eTwo modes, one transformer\u003c\/h3\u003e\n\u003cp\u003eA 3-position pad (0, -12, -18dB) works identically in both modes, and a bandwidth switch adds a \"Big Roll\" option, a gentle 6dB-per-octave top-end rolloff starting at 1kHz, useful when re-amping through pedals that react too brightly to a full-bandwidth signal. DI input impedance scales with the connected preamp (up to 324 times its input impedance, or 388kΩ\/324kΩ with the pad engaged), and Amp-Up input impedance runs above 2kΩ.\u003c\/p\u003e\n\u003ch3\u003eA solid steel body built for the road\u003c\/h3\u003e\n\u003cp\u003eThe 1\/4\" and XLR jacks are electrically isolated from each other, the XLR output is balanced, and a ground lift switch clears hum loops without touching the rest of the signal path. A heavy-duty steel enclosure and no dependence on mains power make the Z-Car equally at home in the studio or on tour. Useful both for tracking a dry guitar or bass signal for later processing, and for classic re-amping, sending a previously recorded track back out through pedals or a guitar amp.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePassive DI and Amp-Up (re-amp) box, no power required\u003c\/li\u003e\n\u003cli\u003eCustom mu-metal shielded transformer\u003c\/li\u003e\n\u003cli\u003e3-position pad: 0 \/ -12 \/ -18dB\u003c\/li\u003e\n\u003cli\u003eBandwidth mode: Flat or \"Big Roll\" (-6dB\/oct from 1kHz)\u003c\/li\u003e\n\u003cli\u003eElectrically isolated 1\/4\" and XLR jacks\u003c\/li\u003e\n\u003cli\u003eBalanced XLR output\u003c\/li\u003e\n\u003cli\u003eGround lift switch\u003c\/li\u003e\n\u003cli\u003eHeavy-duty steel enclosure, built in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: passive DI \/ Amp-Up (re-amp) box\u003c\/li\u003e\n\u003cli\u003ePad: 0 \/ -12 \/ -18dB\u003c\/li\u003e\n\u003cli\u003eDI input impedance: up to 324x the preamp's input impedance (388kΩ\/324kΩ with pad)\u003c\/li\u003e\n\u003cli\u003eAmp-Up input impedance: \u0026gt;2kΩ\u003c\/li\u003e\n\u003cli\u003eXLR output impedance: approx. 330Ω down to 140Ω depending on pad\u003c\/li\u003e\n\u003cli\u003eBandwidth mode: Flat \/ Big Roll (-6dB\/oct from 1kHz)\u003c\/li\u003e\n\u003cli\u003eConnectors: 1\/4\" and XLR, isolated\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Locomotive Audio","offers":[{"title":"Default Title","offer_id":54961112645969,"sku":"61010","price":399.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/Locomotive_Audio_Z-Car_1.jpg?v=1789721346"},{"product_id":"locomotive-audio-40am-2","title":"Locomotive Audio 40AM-2","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eLocomotive Audio 40AM-2\u003c\/strong\u003e is a two-channel, standalone version of the 40AM-1 circuit in its own rack chassis, not a pair of 500-series modules, two independent channels of octal tube electronics built into a single, mains-powered unit. It's the two-channel counterpart to the single-channel 40AM-1 module from the same octal Locomotive preamp family.\u003c\/p\u003e\n\u003ch3\u003eTwice the same heavy American character\u003c\/h3\u003e\n\u003cp\u003eEach channel repeats the 40AM-1 design: two 6SJ7 tubes (pentode input, triode output) and a maximum gain of 52dB, built on the same topology combining the RCA BA-11A and Gates SA-70 from 1940s American broadcast radio. MuMetal input transformers and nickel-and-steel output transformers, wound in-house, are shared across both channels.\u003c\/p\u003e\n\u003ch3\u003eA dedicated line input with no phantom power risk\u003c\/h3\u003e\n\u003cp\u003eEach channel gets its own 5-position Response switch, 5-position mic\/line input switch, -20dB pad, 85Hz high-pass filter and high-impedance front-panel DI input. A separate line-level XLR input lets you send a line signal in \"around\" the mic circuit, with no risk of accidentally applying phantom power to a sensitive source. Two channels of the same octal electronics in one unit make stereo tracking or parallel-doubling a track with the same dense tonal character straightforward.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2-channel octal tube preamp, standalone rack chassis\u003c\/li\u003e\n\u003cli\u003eTwo independent 40AM-1 circuits in one unit\u003c\/li\u003e\n\u003cli\u003eTubes: 2x 6SJ7 per channel\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 52dB per channel\u003c\/li\u003e\n\u003cli\u003e5-position Response switch per channel\u003c\/li\u003e\n\u003cli\u003eDedicated line XLR input with no phantom power risk\u003c\/li\u003e\n\u003cli\u003e-20dB pad and 85Hz high-pass filter per channel\u003c\/li\u003e\n\u003cli\u003eHand-built in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: 2-channel octal tube preamp\u003c\/li\u003e\n\u003cli\u003eTubes: 2x 6SJ7 per channel\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 52dB per channel\u003c\/li\u003e\n\u003cli\u003eTransformers: MuMetal input, nickel-and-steel output, in-house wound\u003c\/li\u003e\n\u003cli\u003ePad: -20dB per channel\u003c\/li\u003e\n\u003cli\u003eHigh-pass filter: 85Hz per channel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Locomotive Audio","offers":[{"title":"Default Title","offer_id":54961112842577,"sku":"61011","price":2699.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/Locomotive_Audio_40AM-2_1.jpg?v=1789721088"},{"product_id":"locomotive-audio-power-mu-500","title":"Locomotive Audio Power Mu 500","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eLocomotive Audio Power Mu 500\u003c\/strong\u003e is a two-channel (stereo) vari-mu tube compressor in the 500-series format, with two NOS dual triode tubes per channel handling gain reduction the classic, musical way, instead of a VCA or optical circuit. It's the only stereo 500-series compressor in the Locomotive Audio lineup.\u003c\/p\u003e\n\u003ch3\u003ePrecise 21-step knobs instead of smooth pots\u003c\/h3\u003e\n\u003cp\u003eInput and output gain are set with 21-position stepped knobs, giving repeatable, recallable settings from session to session, and separate AC and DC threshold controls let you shape both the onset of compression and its knee and effective ratio, rather than relying on one all-purpose threshold knob. Custom interstage transformers are built to keep compression smooth without harsh artifacts under heavy gain reduction.\u003c\/p\u003e\n\u003ch3\u003eStereo-link and a sidechain filter for bus duty\u003c\/h3\u003e\n\u003cp\u003eA stereo-link switch ties both channels together for coherent mix-bus or mastering compression, a sidechain high-pass filter protects low frequencies from over-compression, and a hardwire bypass plus a separate power switch (to extend tube life when the unit isn't in use) round out the feature set packed into one 500-series module. Stepped gain knobs make it easy to recall exact settings between sessions, which matters more on a mix bus or mastering chain than on a single vocal track, where repeatability counts.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2-channel (stereo) vari-mu tube compressor, 500-series\u003c\/li\u003e\n\u003cli\u003eNOS dual triode tubes, two per channel\u003c\/li\u003e\n\u003cli\u003e21-step input and output gain knobs\u003c\/li\u003e\n\u003cli\u003eSeparate AC and DC threshold controls\u003c\/li\u003e\n\u003cli\u003eSidechain high-pass filter\u003c\/li\u003e\n\u003cli\u003eStereo-link switch\u003c\/li\u003e\n\u003cli\u003eHardwire bypass and a separate power switch\u003c\/li\u003e\n\u003cli\u003eCustom interstage transformers\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: 2-channel vari-mu tube compressor, 500-series\u003c\/li\u003e\n\u003cli\u003eAttack: 10-75ms\u003c\/li\u003e\n\u003cli\u003eRelease: 150ms - 1.5 seconds\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20Hz – 20kHz\u003c\/li\u003e\n\u003cli\u003eS\/N: \u0026gt;70dB\u003c\/li\u003e\n\u003cli\u003eWeight: approx. 2.3kg (5lb)\u003c\/li\u003e\n\u003cli\u003ePower: +16V\/260mA, -16V\/300mA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Locomotive Audio","offers":[{"title":"Default Title","offer_id":54961112908113,"sku":"61007","price":1699.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/Locomotive_Audio_Power_Mu_500_1.jpg?v=1789721337"},{"product_id":"locomotive-audio-wt-comp","title":"Locomotive Audio WT-Comp","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eLocomotive Audio WT-Comp (Weight Tank)\u003c\/strong\u003e is a single-channel, soft-knee vari-mu tube compressor designed by St. Louis-based Eric Strouth, drawing on the Universal Audio 175B and the Altec 436A, with some ideas borrowed from Locomotive's own Model 14B. It's the second standalone (non-500-series) tube compressor in the Locomotive Audio range, alongside the Model 14B.\u003c\/p\u003e\n\u003ch3\u003eTwo characters in one switch\u003c\/h3\u003e\n\u003cp\u003eA Smooth\/Drive switch changes how the 6BC8 and 12AU7 tubes behave: Smooth gives the sweet, gentle tone typical of classic vari-mu compression, while Drive pushes the tubes toward a richer, more harmonically saturated character. A fixed compression threshold (roughly 3.5-4:1 per the manufacturer's own figures) simplifies control to two main knobs: attack (12-50ms) and release (200ms-2 seconds).\u003c\/p\u003e\n\u003ch3\u003eThree steel transformers instead of one do-it-all part\u003c\/h3\u003e\n\u003cp\u003eTwo transformers in the input stage and one on the output, all-steel construction, build the compressor's characteristically heavy tone. A VU meter tracks gain reduction, a TRS jack lets you pair two WT-Comp units for stereo work, and a hardwire bypass lets you compare raw and processed signal at any moment. The \"Weight Tank\" name points to the sonic heft the circuit adds to a signal, especially useful on vocals and bass guitar, where density and presence in the mix matter most.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSingle-channel soft-knee vari-mu tube compressor\u003c\/li\u003e\n\u003cli\u003eTubes: 6BC8 and 12AU7\u003c\/li\u003e\n\u003cli\u003eSmooth \/ Drive mode switch\u003c\/li\u003e\n\u003cli\u003eFixed compression threshold, approx. 3.5-4:1\u003c\/li\u003e\n\u003cli\u003eAttack 12-50ms, release 200ms – 2 seconds\u003c\/li\u003e\n\u003cli\u003e3 all-steel transformers (2 input, 1 output)\u003c\/li\u003e\n\u003cli\u003eTRS jack for stereo pairing\u003c\/li\u003e\n\u003cli\u003eHardwire bypass, designed by Eric Strouth (St. Louis, USA)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: single-channel vari-mu tube compressor\u003c\/li\u003e\n\u003cli\u003eTubes: 6BC8, 12AU7\u003c\/li\u003e\n\u003cli\u003eAttack: 12-50ms\u003c\/li\u003e\n\u003cli\u003eRelease: 200ms – 2 seconds\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20Hz – 20kHz\u003c\/li\u003e\n\u003cli\u003eTHD+N: \u0026lt;1%, S\/N: \u0026gt;70dB\u003c\/li\u003e\n\u003cli\u003eDimensions: 19\", 2U\u003c\/li\u003e\n\u003cli\u003eWeight: 7kg\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Locomotive Audio","offers":[{"title":"Default Title","offer_id":54961112973649,"sku":"61013","price":1359.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/Locomotive_Audio_WT-Comp_1.jpg?v=1789721341"},{"product_id":"locomotive-audio-model-l72p1","title":"Locomotive Audio Model L72P1","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eLocomotive Audio Model L72P1\u003c\/strong\u003e is a mic preamp in a 500-series module remaking the V72 tube amplifier module, originally built for the German Radio Network and later used at studios including Decca and Abbey Road. In place of the original's pentode tube it runs a cascode dual-triode circuit, chosen for parts reliability and availability. It's the single-channel counterpart to the two-channel L72P2 from the same V72-inspired preamp line.\u003c\/p\u003e\n\u003ch3\u003eMore gain than the 1950s original\u003c\/h3\u003e\n\u003cp\u003eIt runs a standard 6922\/E88CC tube, also compatible with 6DJ8\/ECC88, 6N32P and 12AU7\/ECC82, making it easy to tune the tube choice to taste. Gain adjusts in 4dB steps up to 54dB, well beyond the original V72 module's fixed 34dB maximum, and an output attenuator in 2dB steps lets you match levels precisely without losing tonal character.\u003c\/p\u003e\n\u003ch3\u003eTransformers wound to match a specific spectrum\u003c\/h3\u003e\n\u003cp\u003eA 6-chamber input transformer (available in \"S\"\/studio or \"non-S\"\/broadcast versions), a 3-chamber nickel-core plate choke, and a multi-section output transformer with four copper shields between windings are all wound in-house at Locomotive to match the original V72's response. A dedicated line input, -20dB and -34dB pads for line-level sources, an 85Hz high-pass filter and 48V phantom power round out the module. The choice between the \"S\" (studio) and \"non-S\" (broadcast) input transformer versions gives an extra degree of tonal tailoring for a specific use, something the original V72 module never offered.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSingle-channel mic preamp, 500-series format\u003c\/li\u003e\n\u003cli\u003eRecreation of the V72 module (German Radio Network, Decca, Abbey Road)\u003c\/li\u003e\n\u003cli\u003eCascode dual-triode circuit instead of the original pentode\u003c\/li\u003e\n\u003cli\u003e6922\/E88CC tube, compatible with 6DJ8\/ECC88, 6N32P, 12AU7\/ECC82\u003c\/li\u003e\n\u003cli\u003eGain up to 54dB in 4dB steps (original: 34dB max)\u003c\/li\u003e\n\u003cli\u003eOutput attenuator in 2dB steps\u003c\/li\u003e\n\u003cli\u003eDedicated line input, -20dB \/ -34dB pads\u003c\/li\u003e\n\u003cli\u003e85Hz high-pass filter, 48V phantom power\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: single-channel tube preamp, 500-series\u003c\/li\u003e\n\u003cli\u003eTube: 6922\/E88CC (compatible: 6DJ8\/ECC88, 6N32P, 12AU7\/ECC82)\u003c\/li\u003e\n\u003cli\u003eGain: up to 54dB, 4dB steps\u003c\/li\u003e\n\u003cli\u003eOutput attenuator: 2dB steps\u003c\/li\u003e\n\u003cli\u003eInput pads: -20dB \/ -34dB (line sources)\u003c\/li\u003e\n\u003cli\u003eHigh-pass filter: 85Hz\u003c\/li\u003e\n\u003cli\u003ePower: 48V phantom\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Locomotive Audio","offers":[{"title":"Default Title","offer_id":54961113104721,"sku":"61009","price":1369.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/Locomotive_Audio_Model_L72P1.jpg?v=1789721329"},{"product_id":"locomotive-audio-model-l72p2","title":"Locomotive Audio Model L72P2","description":"\u003cdiv lang=\"en\"\u003e\n\u003cp\u003e\u003cstrong\u003eLocomotive Audio Model L72P2\u003c\/strong\u003e is a two-channel, standalone version of the L72P1 circuit in its own 19\"\/2U rack chassis, not a pair of 500-series modules, two independent channels of the same V72 recreation in one unit. It's the two-channel counterpart to the single-channel L72P1 module from the same V72-inspired preamp line.\u003c\/p\u003e\n\u003ch3\u003eTwo full V72 channels instead of one\u003c\/h3\u003e\n\u003cp\u003eEach channel has its own mic and line XLR inputs, a high-impedance front-panel DI input, a balanced XLR output and 48V phantom power, repeating the same tube complement (6922\/E88CC, compatible with 6DJ8\/ECC88, 6N32P and 12AU7\/ECC82) and the same 54dB maximum gain in 4dB steps as the L72P1. Input impedance switches via an internal jumper between 400kΩ and 200kΩ.\u003c\/p\u003e\n\u003ch3\u003eThe same transformer-winding precision\u003c\/h3\u003e\n\u003cp\u003eThe input transformer (\"S\"\/studio and \"non-S\"\/broadcast versions), the 3-chamber nickel-core plate choke, and the output transformer with four copper shields are built identically to the L72P1, just doubled across two channels. A 2dB-step output attenuator, a dedicated line input, and an 85Hz high-pass filter on each channel give full, independent control over both sides of a stereo signal. As with the L72P1, the choice of \"S\" or \"non-S\" input transformer version is available per channel, letting you tailor the tone independently for both sides of a stereo signal.\u003c\/p\u003e\n\u003ch3\u003eKEY FEATURES\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e2-channel mic preamp, standalone 19\"\/2U rack chassis\u003c\/li\u003e\n\u003cli\u003eTwo independent L72P1 circuits in one unit\u003c\/li\u003e\n\u003cli\u003e6922\/E88CC tube per channel (compatible: 6DJ8\/ECC88, 6N32P, 12AU7\/ECC82)\u003c\/li\u003e\n\u003cli\u003eGain up to 54dB per channel, 4dB steps\u003c\/li\u003e\n\u003cli\u003eSwitchable input impedance: 400kΩ \/ 200kΩ (jumper)\u003c\/li\u003e\n\u003cli\u003eDedicated line input and DI on each channel\u003c\/li\u003e\n\u003cli\u003e48V phantom power per channel\u003c\/li\u003e\n\u003cli\u003eHand-built in the USA\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTECHNICAL SPECIFICATIONS\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eType: 2-channel tube preamp\u003c\/li\u003e\n\u003cli\u003eTube: 6922\/E88CC per channel (compatible: 6DJ8\/ECC88, 6N32P, 12AU7\/ECC82)\u003c\/li\u003e\n\u003cli\u003eMaximum gain: 54dB per channel, 4dB steps\u003c\/li\u003e\n\u003cli\u003eInput impedance: 400kΩ \/ 200kΩ (jumper-switchable)\u003c\/li\u003e\n\u003cli\u003eOutput attenuator: 2dB steps\u003c\/li\u003e\n\u003cli\u003eHigh-pass filter: 85Hz per channel\u003c\/li\u003e\n\u003cli\u003ePower: 48V phantom per channel\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Locomotive Audio","offers":[{"title":"Default Title","offer_id":54961113235793,"sku":"61008","price":3039.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0729\/8741\/0769\/files\/Locomotive_Audio_Model_L72P2_1.jpg?v=1789721332"}],"url":"https:\/\/wrdtunes.com\/collections\/locomotive-audio.oembed","provider":"Wired Tunes","version":"1.0","type":"link"}