Purple Audio MC77 1176 Style Compressor/Limiter

Description

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Purple Audio MC77 1176 Style Compressor/Limiter
1176 style Compressor/Limiter hand-made in the USA.
Manufacturers Description
The MC77 is a standard 19″ two space rack-mountable limiter. The MC77 recreates the audio circuitry of the revision E 1176, using modern components matched to the original.
One significant component is the input attenuator. The input attenuator that was custom made for the original revisions A-F 1176 and for the Purple MC76 by Clarostat was discontinued in 2002. It was a J series T-pad attenuator with two 600 OHM “build out” resistors to keep a constant 600 OHM load on the source and primary of the input transformer. Clarostat changed carbon manufacturers and the new carbon manufacturer was unable to make the part. Purple temporarily stopped making the MC76 to find a solution. We tried several three deck Clarostat 70 series pots in different configurations to achieve the same loading and to match the taper. We found a solution that matched the original. Based on that feedback, from hundreds of satisfied MC76 users we incorporated useful new features into the new MC77.
Features:
Discrete Transistor Audio Path Electronics
Single Element Class A Output Amplifier
Transformer Balanced XLR Inputs and Outputs
Zener Shunt Regulated Audio Power Supply
Compression Ratios – 4:1, 8:1, 12:1 and 20:1
Fast Attack Time – 20 to 800 microseconds
Release Time – 50 milliseconds to 1.1 second
Gain of 45dB (full gain with no limiting)
Ruggedized Design – PCB stiffener, chassis mounts
Purple Anodized Aluminum Front Panel
True Bypass via sealed relay w/front panel switch
Improved stereo linking w/front panel switch
Sidechain insert loop or key input w/front panel switch
Buffered VU meter can monitor input or output level at +4dBu
LED meter lights that don’t burn out
Heavy gauge black stainless steel enclosure
155v/230v operation switchable from rear panel
The MC77 should be fitted with 1/4A slow-blow @ 110V, 1/8A Slow-blow @220V.
1/4A slow-blow available from Mouser or Digikey in the US.
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