{"product_id":"fairchild-660-mono-compressor-limiter-274-vintage","title":"Fairchild 660 Mono Compressor\/Limiter #274 (Vintage)","description":"\u003cp\u003eThe \u003cstrong\u003eFairchild 660\u003c\/strong\u003e is the mono version of the legendary Fairchild 670, a variable-mu type compressor, using vacuum tubes for reduction of gain right in the audio signal path, (no re-routing to a compression circuit).\u003c\/p\u003e \u003cp\u003eControls include a stepped Input Gain and continuously variable Threshold control, as well as a stepped 6-position switch for Attack and Release, that allow for four different combinations and two program-dependent settings. Set-screws on the back of the unit control the ratio; anywhere from 2:1 as a compressor to 30:1 as a limiter.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eControls\u003c\/strong\u003e \u003c\/p\u003e\u003cul\u003e \u003cli\u003eInput Impedance: 600\u003c\/li\u003e \u003cli\u003eOutput Impedance: 600\u003c\/li\u003e \u003cli\u003eInput Levels: Normal line levels (+4 or +8 VU)\u003c\/li\u003e \u003cli\u003eOutput Level: +4 or +8 dbm line (+27 dbm after clipping point) \u003c\/li\u003e \u003cli\u003eGain:16db \u003c\/li\u003e \u003cli\u003eFrequency Response: 20 cycles to 20kc\u003c\/li\u003e \u003cli\u003eNoise Level: 70 db below +4dbm\u003c\/li\u003e \u003cli\u003eLimiting Noises: No audible thumps produced \u003c\/li\u003e \u003cli\u003eIntermodulation or Harmonic Distortion: less than 1% at any level up to +18dbm output (no limiting); less than 1% at 10db limiting and +12dbm output \u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eAttack time\u003c\/strong\u003e (adjustable) \u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e.2 milliseconds in positions 1, 2 and 6 \u003c\/li\u003e \u003cli\u003e.4 milliseconds in positions 3 and 5 \u003c\/li\u003e \u003cli\u003e.8 milliseconds in position 4\u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eRelease time\u003c\/strong\u003e (from 10db of limiting) \u003cbr\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePosition 1: .3 seconds \u003c\/li\u003e \u003cli\u003ePosition 2: .8 seconds \u003c\/li\u003e \u003cli\u003ePosition 3: 2 seconds for multiple peaks \u003c\/li\u003e \u003cli\u003ePosition 4: 5 seconds \u003c\/li\u003e \u003cli\u003ePosition 5: Automatic function of program material: 2 seconds for individual peaks, 10 seconds for multiple peaks \u003c\/li\u003e \u003cli\u003ePosition 6: \u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eAutomatic function\u003c\/strong\u003e of program material: \u003c\/p\u003e\u003cul\u003e \u003cli\u003e.3 seconds for individual peaks\u003c\/li\u003e \u003cli\u003e10 seconds for multiple peaks\u003c\/li\u003e \u003cli\u003e25 seconds for consistently high program level. \u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eCompression Ratio\u003c\/strong\u003e: \u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eA function of the amount of limiting as well as setting of the two threshold controls which can be set to operate at ratios from 1:1 to 1:20 \u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003e\u003cstrong\u003eControls\u003c\/strong\u003e: \u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eInput Gain control Step attenuator; 1 db per step \u003c\/li\u003e \u003cli\u003eThreshold Control continuously variable \u003c\/li\u003e \u003cli\u003eTime Constant Switch 6 positions, so as to provide fixed and variable time constants for any type of program material. \u003c\/li\u003e \u003cli\u003eMetering Switch 3 positions, so as to measure plate current of each of the control tubes, or as a limiting indicator \u003c\/li\u003e \u003cli\u003eOn-Off switch \u003c\/li\u003e \u003c\/ul\u003e  \u003cp\u003eThe Fairchild 670 is the grandaddy of all analog compressors. Used on too many famous recordings to list, this was a studio mainstay throughout the heyday of vacuum tube equipment in the 1950s and 60s. Its use in Bill Putnam's United Western Recorders \u003cem\u003ealone\u003c\/em\u003e accounted for numerous hit records. The single channel 660 model was used extensively at Abbey Road during the Beatles tenure.\u003c\/p\u003e \u003cp\u003eVisit our \u003ca href=\"https:\/\/vintageking.com\/fairchild-660-670-compressor-limiter\"\u003eFairchild 660\/670 page\u003c\/a\u003e for more information.\u003c\/p\u003e \u003cp\u003e\u003cem\u003eVARIABLE-MU® is a registered trademark of Manley Laboratories, Inc.\u003c\/em\u003e\u003c\/p\u003e","brand":"Fairchild","offers":[{"title":"Default Title","offer_id":44450690170983,"sku":"110574","price":49995.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0658\/8848\/5479\/files\/fairchild-660-mono-compressor-limiter-274-vintage_110574_1_954d736a-c5ff-49f6-80d4-4af6119e83f0.jpg?v=1787094113","url":"https:\/\/vintageking.com\/products\/fairchild-660-mono-compressor-limiter-274-vintage","provider":"Vintage King","version":"1.0","type":"link"}