{"product_id":"heritage-audio-tt-73-portable-tabletop-mic-preamp","title":"Heritage Audio TT-73 Portable Tabletop 73-Style Mic Preamp","description":"\u003ch2\u003e\u003cbr\u003e\u003c\/h2\u003e\n\u003c!-- Video Section with Keyword Title --\u003e\n\u003cdiv style=\"margin: 20px auto 10px auto; text-align: center; max-width: 800px;\"\u003e\n\u003ch2 style=\"font-size: 20px; margin-bottom: 12px;\"\u003eHeritage Audio TT-73 Tabletop Preamp Overview\u003c\/h2\u003e\n\u003ciframe style=\"width: 100%; max-width: 800px; height: 450px; display: block; margin: 0 auto; border-radius: 8px;\" src=\"https:\/\/www.youtube.com\/embed\/zw2lSjKEQQ0?si=LFhB4f6z32_Wqwzf\"\u003e\n  \u003c\/iframe\u003e\n\u003c\/div\u003e\n\u003c!-- Section 1 --\u003e\n\u003cdiv class=\"par-section\"\u003e\n\u003cdiv class=\"par-image\"\u003e\u003cimg alt=\"Heritage Audio TT-73 portable tabletop mic preamp\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Heritage_Audio_TT-73_front_on_view.png?v=1771904458\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"par-text\"\u003e\n\u003ch2\u003eSingle-Channel DMA73 in Portable Tabletop Format\u003c\/h2\u003e\n\u003cp\u003eSame 3-stage Class A circuit as Heritage's DMA73 (73-style preamp) in a portable tabletop chassis with carrying handle. 80 dB mic preamp, 50 dB line preamp, genuine B283 gain card. Carnhill input\/output transformers. RAF blue-gray steel body with wood end cheeks. 6.65 lbs (3.02 kg). Internal 100–240V PSU engineered to operate near transformers without noise.\u003c\/p\u003e\n\u003cp\u003eHigh-gain positions show higher impedance — ideal for vintage ribbon mics. HI\/LO impedance switch: 1,200 Ω \/ 300 Ω minimum. Line input 10 kΩ bridging. Max gain \u0026gt;80 dB. Noise \u0026lt;-100 dBu. THD \u0026lt;0.025% @ 1 kHz \/ \u0026lt;0.05% @ 100 Hz. Max output \u0026gt;+26 dBu into 600 Ω. Output impedance \u0026lt;75 Ω.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Section 2 --\u003e\n\u003cdiv class=\"par-section reverse\"\u003e\n\u003cdiv class=\"par-image\"\u003e\u003cimg alt=\"Heritage Audio TT-73 JFET DI thru ground lift onstage hotel\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Heritage_Audio_TT-73_case_view.png?v=1771904458\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"par-text\"\u003e\n\u003ch2\u003eClass A JFET DI With Thru Jack and Ground Lift\u003c\/h2\u003e\n\u003cp\u003eUltra-high-impedance JFET DI (\u0026gt;2 MΩ) on Neutrik 1\/4\" jack sits before mic input transformer — DI signal passes through Carnhill transformer for classic 73 color. DI thru jack with ground lift switch allows simultaneous hum-free use of instrument amps (send clean signal to TT-73, send amp signal to stage amp). Perfect for bass\/guitar direct to FOH at 1073-driven line levels.\u003c\/p\u003e\n\u003cp\u003e80 Hz HPF (18 dB\/oct, 3rd-order Bessel, all-discrete Class A). -20 dB pad before input transformer prevents overload on loud sources. Phase reverse. +48V phantom. Marconi-style knobs, vintage engraved push buttons. Frequency response 20 Hz (+0.3 dB) to 20 kHz (-0.2 dB).\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Section 3 --\u003e\n\u003cdiv class=\"par-section\"\u003e\n\u003cdiv class=\"par-image\"\u003e\u003cimg alt=\"Heritage Audio TT-73 2N3055 output stage portable recording\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Heritage_Audio_TT-73_case_view.png?v=1771904458\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"par-text\"\u003e\n\u003ch2\u003eRoad-Ready for Stage, Hotel, Mobile Recording\u003c\/h2\u003e\n\u003cp\u003eBuilt for portability: stage box (bring mics up to line level without long cable runs), FOH DI (musicians deliver 1073 line levels to sound engineers), hotel\/tour bus tracking, location recording. Class A single-ended 2N3055-driven high-headroom output stage. Output control allows preamp overdrive for saturation.\u003c\/p\u003e\n\u003cp\u003eNeutrik gold XLRs: mic in, line in, out. As an authorized dealer, Pro Audio Reserve ensures you receive a genuine Heritage Audio product backed by full manufacturer warranty and long-term support.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eHighlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003ePortable tabletop 73-style preamp with carrying handle\u003c\/li\u003e\n\u003cli\u003eSingle-channel DMA73 circuit: 3-stage Class A, B283 gain card\u003c\/li\u003e\n\u003cli\u003e80 dB mic preamp, 50 dB line preamp\u003c\/li\u003e\n\u003cli\u003eCarnhill input and output transformers\u003c\/li\u003e\n\u003cli\u003eHI\/LO impedance: 1,200 Ω \/ 300 Ω minimum (higher at high-gain positions)\u003c\/li\u003e\n\u003cli\u003eLine input: 10 kΩ bridging\u003c\/li\u003e\n\u003cli\u003eClass A JFET DI: \u0026gt;2 MΩ input (before transformer — DI signal passes through Carnhill)\u003c\/li\u003e\n\u003cli\u003eDI thru jack with ground lift (simultaneous hum-free amp use)\u003c\/li\u003e\n\u003cli\u003e80 Hz HPF: 18 dB\/oct, 3rd-order Bessel, all-discrete Class A\u003c\/li\u003e\n\u003cli\u003e-20 dB pad (before input transformer)\u003c\/li\u003e\n\u003cli\u003ePhase reverse, +48V phantom\u003c\/li\u003e\n\u003cli\u003e2N3055-driven Class A single-ended output stage\u003c\/li\u003e\n\u003cli\u003eMax gain: \u0026gt;80 dB | Max output: \u0026gt;+26 dBu into 600 Ω\u003c\/li\u003e\n\u003cli\u003eNoise: \u0026lt;-100 dBu | THD: \u0026lt;0.025% @ 1 kHz \/ \u0026lt;0.05% @ 100 Hz\u003c\/li\u003e\n\u003cli\u003eOutput impedance: \u0026lt;75 Ω (factory terminated 600 Ω)\u003c\/li\u003e\n\u003cli\u003eFrequency response: 20 Hz (+0.3 dB) to 20 kHz (-0.2 dB)\u003c\/li\u003e\n\u003cli\u003eInternal 100–240V PSU (engineered for noise-free operation near transformers)\u003c\/li\u003e\n\u003cli\u003eRAF blue-gray steel + wood end cheeks, Marconi-style knobs\u003c\/li\u003e\n\u003cli\u003eWeight: 6.65 lbs (3.02 kg)\u003c\/li\u003e\n\u003cli\u003eHandmade in Spain\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHeritage Audio TT-73 Specifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #ccc;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"text-align: left; padding: 10px; border: 1px solid #ccc; width: 35%;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 10px; border: 1px solid #ccc;\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eFormat\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003ePortable tabletop with carrying handle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003ePreamp Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e3-stage Class A, fully discrete, solid state (DMA73 circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eGain Card\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eGenuine B283 gain card (modular construction)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eTransformers\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eCarnhill input and output\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eMic Preamp Gain\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eSlightly greater than 80 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eLine Preamp Gain\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e50 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eMic Input Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eHI: 1,200 Ω minimum | LO: 300 Ω minimum (transformer balanced and floating, higher at high-gain positions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eLine Input Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e10 kΩ bridging (transformer balanced and floating)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eDI Input Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eGreater than 2 MΩ (Class A JFET, unbalanced)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eDI Circuit Position\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eBefore mic input transformer (DI signal passes through Carnhill transformer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eOutput Impedance\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eLess than 75 Ω (transformer balanced and floating, factory terminated 600 Ω)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eMaximum Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eGreater than +26 dBu into 600 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eOutput Stage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eClass A single-ended, 2N3055-driven, high headroom\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eNoise\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eLess than -100 dBu\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eTHD\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eLess than 0.025% @ 1 kHz | Less than 0.05% @ 100 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e20 Hz (+0.3 dB) to 20 kHz (-0.2 dB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003ePad\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e-20 dB (before input transformer)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eHigh-Pass Filter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e80 Hz, 18 dB\/octave (3rd-order Bessel, all-discrete Class A)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003ePhantom Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e+48V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003ePhase Reverse\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eYes (polarity switch)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eAnalog Inputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e2 x Neutrik gold XLR (mic, line), 1 x Neutrik 1\/4\" (DI)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eAnalog Outputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e1 x Neutrik gold XLR, 1 x 1\/4\" (DI thru with ground lift)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003ePower Source\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eInternal PSU, 100–240V AC (worldwide voltage, IEC cable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e6.65 lbs (3.02 kg)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eConstruction\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eRAF blue-gray steel chassis, wood end cheeks, Marconi-style knobs, vintage engraved push buttons, carrying handle\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eManufactured\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eSpain\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #ccc;\"\u003e\n\u003cthead\u003e\n\u003ctr style=\"background-color: #f2f2f2;\"\u003e\n\u003cth style=\"text-align: left; padding: 10px; border: 1px solid #ccc;\"\u003eIncluded Items\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eHeritage Audio TT-73 Portable Tabletop Mic Preamp\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eIEC Power Cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eUser Manual\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Heritage Audio","offers":[{"title":"Default Title","offer_id":48035496788123,"sku":null,"price":1299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Heritage_Audio_TT-73_front_view.png?v=1771992853","url":"https:\/\/proaudioreserve.com\/products\/heritage-audio-tt-73-portable-tabletop-mic-preamp","provider":"Pro Audio Reserve","version":"1.0","type":"link"}