Purple Audio MC77 Limiter

Purple Audio

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Product Code: 9999-16948
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The Purple Audio MC77 Limiter is a recreation of one of the most iconic solid state limiters made in history. Designed with modern components the MC77 is sure to be a classic of its own.

The Purple Audio MC77 Limiter is a standard 19″ two space rackmountable 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. They tried several three deck Clarostat 70 series pots in different configurations to achieve the same loading and to match the taper. They found a solution that matched the original. Based on that feedback, from hundreds of satisfied MC76 users they incorporated useful new features into the new MC77.

Purple Audio MC77 Limiter Features

  • Inherited from the Purple Audio MC76:
    • 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
    • 3 Year Warranty*
  • NEW in the MC77:
    • 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 cold rolled steel enclosure
    • 155v/230v operation switchable from rear panel

Purple Audio MC77 Limiter Specifications

  • 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

Purple Audio MC77 Limiter Includes

  • MC77 Limiter
  • IEC Power Cable
  • Paperwork/Warranty Information

1 Review Hide Reviews Show Reviews

  • 5
    AMAZING! Best "Clone"!
    Preston Scott

    Ok so I don"t have this yet but I"m gonna get two of them due to the fact that I just run Stereo or Dual mono tracks with eight analog inputs and outputs on my Avid MTRX which I need a review to write as well. Anyway back to the purple 77"s think about it if you have the budget then what would actually be the best option on the table? Limiting Amplifiers are to me anyway the funniest and most useful dynamic processors that I"ve come across I mean sure I have an API 2500 but frankly I"m lacking with dynamic processors. At the very least you should give purple 77"s a try