AP1 & AP2 Circuit Designs (& Component Values)

[Pete K]

I'm rebuilding my AP2, having bought it last year with one burned out channel. I'm on around the 5th revision of the circuit board from China and will soon be building a prototype (possibly with different driver transistors, original GE D43C7 transistors being as rare as hens' teeth). The schematic gives different component values for AP1 and AP2, but even some values for the AP2 'as built' are incorrect. 

Does anybody have correct component values for AP1 of this design, please? The components appear to be R3, R5, R19, R21, R27, R29, R35, R37, R63 and VR1. 

There appear to be three (or more?) different AP1 circuit board designs so I assume there are three or more AP2 designs too.

I'm aware of the reputation of AP2s for them to self-combust, but my amplifier's previous owner drove it hard from around 1980 to 2019 before it blew up, which isn't too shabby (although he had experienced a couple of minor failures including exploding main smoothing capacitors).

Pete K

[Colin Pascoe]

Hi Pete,

 

Please can you pm me colina...@hotmail.com I may be able to point you in the right direction.

 

Thanks,

Colin

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