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RE: Yamaha C2A -- anyone intimately familiar with this preamp? Repair advice needed...

First I would get direct replacements for those transistors.

Second, check all the associated circuitry of those transistors. They usually just don't blow for no reason. Recap the unit as well. Look for toasted resistors near the transistors.

My guess is your transistors choice isn't suited to that circuit, eg won't turn on and pass a signal.

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