{"product_id":"weight-tank-vt-72-vacuum-tube-microphone-preamp-1","title":"Weight Tank VT-72 Vacuum Tube Microphone Preamp","description":"\u003cp\u003eInspired by the V72 modules originally built for the German Radio Network, the WT-72 offers 56 dB of gain, which can be driven by a microphone or line level source. The vintage modules only offered 34 dB of gain, so an additional 22 dB of gain is made in the WT-72 with small adjustments to the circuit while maintaining the most sought after tone and character we have all come to love.\u003cbr\u003e\u003cbr\u003eCustom input and output transformers, as well as output plate choke help provide the performance and character of its vintage inspiration!\u003cbr\u003e\u003cbr\u003eTRUE TO THE ORIGINAL ALL TUBE DESIGN\u003cbr\u003e\u003cbr\u003eJust as the vintage design required, the WT-72 employs both AC \u0026amp; DC voltage feedback, providing the proper gain and necessary stability.\u003cbr\u003e\u003cbr\u003eQUIET GAIN SWITCHING\u003cbr\u003e\u003cbr\u003eThe all new WT-72 sets gain with attenuation and altering AC \u0026amp; DC voltage feedback. DC feedback switching would normally introduce large pops, causing harm to your monitors, or even worse, your hearing. The user would need to manually lower monitor volume before switching gain, making for a frustrating experience. A special muting system in the WT-72 performs a brief mute of the output between each step of gain. This mute eliminates the loud transient and allows the tubes to stabilise before the output becomes unmuted.\u003cbr\u003e\u003cbr\u003eHYBRID SWITCHING SYSTEM\u003cbr\u003e\u003cbr\u003eAn 11-position rotary switch utilises both mechanical and photo relays to change the amount of gain, \u003cbr\u003eoffering great flexibility.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch5\u003e\n\u003cstrong\u003eHow It's Done\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h5\u003e\n\u003cp\u003e\u003cbr\u003eGain knob settings Off - 36 dB are switched by attenuating signal to the first EF86, while the remaining 20 dB of gain (36 - 56 dB) are switched by changing AC \u0026amp; DC feedback.\u003cbr\u003e\u003cbr\u003eWHY IS ANY OF THIS IMPORTANT?\u003cbr\u003e\u003cbr\u003eBy changing gain with voltage feedback (gain knob at 36-56 dB), there is less noise at less gain!\u003cbr\u003e\u003cbr\u003eFor example, at 36 dB of gain, you will have 20 dB less noise than at 56 dB of gain. We are limited with the amount of voltage feedback to change gain because there is a \"sweet spot\" for stability and frequency response. Therefore, using attenuation before the tube gain stages (gain knob at Off - 36 dB), allows the WT-72 to have the most gain flexibility and best noise performance possible.\u003cbr\u003e\u003cbr\u003eTRANSFORMERS\u003cbr\u003eTransformer balanced input and output give the WT-72 the character of the original\u003cbr\u003e\u003cbr\u003eTUBE CIRCUITRY\u003cbr\u003eAudio passes through two EF86 tubes giving 56 dB of gain. The signal path contains no solid-state components.\u003cbr\u003e\u003cbr\u003eOUTPUT HEADROOM\u003cbr\u003eA plate choke feeding the output EF86 provides large output swings at low distortion.\u003cbr\u003e\u003cbr\u003eLINE INPUT\u003cbr\u003eWhen \"Line\" is selected from the XLR IN switch, a 36 dB pad is placed before the input TX.\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch5\u003e\n\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003cbr\u003e\n\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eMic \/ Line (XLR) and High Impedance DI Input\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDI defeats XLR input when plugged in\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTwo EF86 equivalent tubes\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e56 dB of gain\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e11 Position Gain Rotary Switch\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePolarity reverse switch\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e36 dB pad switch (Line Select)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e48 volt phantom power switch\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eXLR input and output connections\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eAmerican input and output transformers and plate choke\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eWhite LED indicators for phantom, power on, and output signal present (-12 dBu minimum for illumination)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eHand-built in USA\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e115v\/230v AC mains option on rear\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eInternal power supply\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e2-year warranty parts and labour\u003cbr\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003e\u003cstrong\u003eSpecs\u003c\/strong\u003e\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eMicrophone Mode input load impedance: Approx. 4k Ω\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eLine Mode input load impedance: 9550 Ω\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eOutput impedance: \u0026lt; 100Ω\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e1\/4\" DI impedance: 500kΩ\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003e56 dB of gain\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20Hz-20kHz\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eMaximum output level: +24dBu \u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eTHD+N: \u0026lt;1% S\/N ratio: \u0026gt;70dB\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eDimensions: 19\"w x 3.5\"h x 10\"d (2u rackspace)\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003eShipping Weight: 15 lbs.\u003cbr\u003e\n\u003c\/li\u003e\n\u003cli\u003ePower Consumption (120\/240VAC): 25 watts\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Locomotive Audio","offers":[{"title":"Weight Tank VT-72 Vacuum Tube Microphone Preamp","offer_id":41796701290663,"sku":null,"price":1889.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0334\/9659\/6612\/files\/Weight_Tank_VT-72_Vacuum_Tube_Microphone_Preamp_Front.png?v=1780419335","url":"https:\/\/oceaniaaudiosales.co.nz\/products\/weight-tank-vt-72-vacuum-tube-microphone-preamp-1","provider":"Oceania Audio Sales","version":"1.0","type":"link"}