{"product_id":"heritage-audio-herchild-670-stereo-tube-compressor","title":"Heritage Audio Herchild 670 Stereo Tube Variable-Mu Compressor Limiter","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 Herchild 670 Stereo Tube Compressor 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\/lT9eJjxWWPA?si=AVYURQgZmS89cMbR\"\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 Herchild 670 stereo tube variable-mu compressor\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Herchild-Model-670-side_view.png?v=1771267883\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"par-text\"\u003e\n\u003ch2\u003eProgram-Dependent Variable-Mu Compression With 22 Tubes\u003c\/h2\u003e\n\u003cp\u003eThe Heritage Audio Herchild 670 is a formidable recreation of the iconic Fairchild 670 — the most coveted compressor in recording history. Built with Class A circuitry featuring 22 tubes and nine transformers, including AMI input transformers and CineMag output transformers, the Herchild 670 delivers the inimitably smooth, creamy, and natural-sounding dynamics control heard on countless classic recordings of the 1960s, 70s, and beyond.\u003c\/p\u003e\n\u003cp\u003eThe variable-mu design produces a gentle soft-knee compression curve with reasonably fast attack and fairly long release times. Compression is program dependent, with gain reduction starting at a very low ratio on small peaks and gradually increasing to brickwall territory on very loud input signals. While the original Fairchild required accessing an internal trim pot for DC Threshold adjustment, the Herchild 670 brings this powerful control out to the front panel for immediate access across a wide range — from a seamless transition between compression and hard limiting to a harder, more pronounced knee.\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 Herchild 670 LAT VERT mid-side processing\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Heritage_Audio_Herchild_HA670_front_view.png?v=1771267883\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"par-text\"\u003e\n\u003ch2\u003eLAT\/VERT Mode for Mid-Side Processing\u003c\/h2\u003e\n\u003cp\u003eLike its vintage inspiration, the Herchild 670 features LAT VERT and LAT VERT LINK modes that were originally developed for vinyl disc mastering. These modes give you full mid-side (M-S) processing capability, allowing you to compress the mid and side signals independently for mixes with increased width, depth, and focus. LAT VERT LINK does the same with both channels linked for traditional stereo operation.\u003c\/p\u003e\n\u003cp\u003eThis mid-side capability makes the Herchild 670 an invaluable mastering tool, allowing precise control over stereo width and image stability. A sidechain filter accommodates modern studio applications by minimizing the influence of low frequencies on compression action — essential for clean, artifact-free compression on full mixes and program material with heavy low-end content.\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 Herchild 670 handwired transformer coupled Class A\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Heritage_Audio_Herchild_HA670_rear_view.png?v=1771267883\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"par-text\"\u003e\n\u003ch2\u003eLegendary Performance at Half the Weight and Price\u003c\/h2\u003e\n\u003cp\u003eLess than 1,000 original Fairchild 670s were ever built, and a functioning vintage unit in good condition commands a staggering price — and weighs 66 pounds. The Herchild 670 delivers the sought-after sonics and program-dependent behavioral characteristics of the original at half the weight (29.32 lbs) and a fraction of the cost, designed to stringent tolerances and meticulously crafted in Heritage Audio's factory in Spain.\u003c\/p\u003e\n\u003cp\u003eFounded in 2011 by engineer\/producer Peter Rodriguez, Heritage Audio leverages handwired, transformer-coupled Class A circuitry with functionality aimed at today's studio workflows. The Herchild 670 delivers clean, problem-free audio with generous headroom and the vintage-flavored sonics that engineers have coveted for over six decades — now available to studios of every pedigree. 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\u003eFaithful recreation of the iconic Fairchild 670 stereo tube compressor\u003c\/li\u003e\n\u003cli\u003eClass A variable-mu tube circuitry with 22 tubes and 9 transformers\u003c\/li\u003e\n\u003cli\u003eAMI input transformers and CineMag output transformers\u003c\/li\u003e\n\u003cli\u003eProgram-dependent soft-knee compression with gradual ratio increase\u003c\/li\u003e\n\u003cli\u003eFront-panel DC Threshold control for variable slope adjustment\u003c\/li\u003e\n\u003cli\u003eLAT\/VERT mode for full mid-side (M-S) processing\u003c\/li\u003e\n\u003cli\u003eLAT\/VERT LINK mode for linked stereo mid-side operation\u003c\/li\u003e\n\u003cli\u003eSidechain filter to minimize low-frequency influence on compression\u003c\/li\u003e\n\u003cli\u003eFrequency response: 40 Hz – 15 kHz (±2 dB)\u003c\/li\u003e\n\u003cli\u003eHalf the weight of a functioning vintage Fairchild 670\u003c\/li\u003e\n\u003cli\u003eHandwired construction designed and built in Spain\u003c\/li\u003e\n\u003cli\u003e6U rackmount format\u003c\/li\u003e\n\u003cli\u003eIdeal for tracking, mixing, and mastering applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHeritage Audio Herchild 670 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\u003eCompressor Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eTube variable-mu compressor\/limiter\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\u003eNumber of Channels\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e2 (stereo)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eCircuit Design\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eClass A, handwired\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\u003eTubes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e22 tubes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\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;\"\u003e9 transformers (AMI input, CineMag output)\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;\"\u003e40 Hz – 15 kHz (±2 dB)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eControls\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eAC\/DC Threshold, Metering, Input Gain, Time Constant, Sidechain Filter\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\u003eStereo Modes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eLAT\/VERT (mid-side), LAT\/VERT LINK (linked mid-side)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eSidechain\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eSidechain filter for low-frequency control\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 Inputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e2 x XLR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\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;\"\u003e2 x XLR\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\u003eRack Spaces\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e6U\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e\u003cstrong\u003eDimensions (H x W x D)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003e10.5\" x 19\" x 7.87\"\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;\"\u003e29.32 lbs\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;\"\u003eStandard IEC AC 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\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 Herchild 670 Stereo Tube Compressor\/Limiter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #fafafa;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003ePower Cable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #ccc;\"\u003eUser Documentation\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"Heritage Audio","offers":[{"title":"Default Title","offer_id":48015791980699,"sku":null,"price":5996.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0646\/4031\/9643\/files\/Herchild-Model-670-side_view.png?v=1771267883","url":"https:\/\/proaudioreserve.com\/products\/heritage-audio-herchild-670-stereo-tube-compressor","provider":"Pro Audio Reserve","version":"1.0","type":"link"}