Purple Audio MC77 1176 Style Compressor/Limiter, from Purple

After a brief hiatus we are making the MC77 again. The input attenuator that was custom made for the original units and for us by Clarostat has been discontinued. The original part 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 unwilling or unable to make the part. We took some time to find the right replacement part. Once we tested out our replacement choice and found that it met our requirements we started making the units again. We tried several three deck Clarostat 70 series pots in different configurations to achieve the same loading and to match the taper. The original and replacement part is drawn in the schematic that you can download below.

The MC77 replaces the MC76 re-engineered 1176 type FET Limiter

After selling hundreds of the original MC76 units we incorporated new features based on user feedback.

NEW Features:

- True Bypass with front panel switch
- New Stereo Link with front panel switch
- Sidechain insert loop - key input, with front panel switch
- Buffered VU meter switchable to monitor input or ouput level at +4dBu
- LED Meter lights
- Heavy Gauge Black Painted Steel Enclosure

Standard Features:

- Audio Path Discrete Transistor Electronics
- Transformer Balanced XLR Inputs and Outputs
- Zener Shunt Regulated Power Supply
- Single Element Class A Output Amplifier
- Compression Ratios 4:1, 8:1, 12:1 and 20:1
- Fast Attack Time 20 microseconds to 800 microseconds
- Release Time 50 milliseconds to 1.1 second
- Gain 45dB (full gain with no limiting)
- Purple Anodized Aluminum Front Panel
- 120/240 volt operation Internally Selected
- 3 Year Warranty*