The Audionics CC-2 Amplifier

  
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Although the Audionics CC-2 is named after Cliff Moulton (Audionics` chief engineer) and Charles Wood (Prez of Audionics), as usual in the business world, the principals in the company masked the identity of the real creator - Bob Sickler, whose name appears as `RLS` on the schematics. Since Bob passed away several years ago in Portland, the leas
The Audionics CC-2 Amplifier - schematic

t I can do is give him the recognition he did not get at the time he designed the amplifier. This is the product that kept Audionics afloat in the late Seventies, selling more than 2000 copies in the US and overseas. There are still lots of people using them today, and I still get the occasional inquiry about repairing one. Well folks, you are on your own, unless you find an engineer or technician sharp enough to replace the obsolete Motorola transistors with similar types and is smart enough to re-compensate the feedback loop for the faster transistors. Back to the story of the CC-2. In the mid-Seventies, Audionics wasn`t doing too well. The amplifier designed by Cliff Moulton was extremely unreliable, with a field failure exceeding 50%. Some days we got back more blown-up amplifiers than we shipped out new. As anyone who`s worked in electronics repair knows, it takes a lot longer to fix something than build it in the first place - most of the cost of electronics is the labor to assemble it. So Cliff`s amp - the PZ-3 - was costing us a lot of money, and threatening the continuation of our jobs. After six months CM finally figured out his amplifier didn`t have enough phase margin, and the driver transistors were underspecified for Safe Operating Area (SOA) current. So if the speaker load was just a little squirrelly (and lots of dealers used speaker-switchers then), the amp would enter brief modes of oscillation, which...



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