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This here is an older amp

And you should look at the updates of the schematic below.

BTW, I would not be too worried about the sound of the rectifiers so long as you can neutralize them! FWIW, the newer devices are a little easier to neutralize...

The amp in the photos has about 60% of the filter capacity of a new one. We went to a larger value and more of them. There is room on the chassis to add them. I would put the rectifiers away from the speaker terminals, and you can put a 1 ohm 5 watt resistor in series to create a PI network with a capacitor input power supply.

We have a lot more capacitance in the driver too. Essentially its set up so that a signal of any amplitude cannot affect the plate voltage of V4, nor that of V1-3, which is on a separate leg of the supply. This takes a few more caps but you have the room.

Of course, we could update it for you. If we do that work, the warranty reactivates. I understand if you want to do DIY, if so, try to keep it neat:

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  Michael Percy Audio  

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