BlueCrab
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  • Hi BlueCrab; thanks again for your input, it is clear to me that you know your stuff! As your entry #275 shows, I still measure 60 VAC. The White Oak mods call for the ctr tap to be connected to the chassis at one point only; the screw formerly holding the terminal strip between the left channel heat sinks. I have just measured the assembled amp again; 60 VAC is on the chassis when the line cord ground N/C.
    BlueCrab
    BlueCrab
    Hi Peter. There is no reason to connect the signal ground (which is the center tap of the secondary) to the chassis. If you isolate the signal ground from the chassis (that screw) and make your measurement from the chassis to line cord ground, there should be 0 vac (and 0 vdc) since the chassis is now completely isolated from all circuits. The amp will still work fine.
    BlueCrab
    BlueCrab
    And you can now connect the chassis to the line cord ground if you desire. You will, of course, want to check which configuration gives you the least hum pickup. But make that measurement with the inputs shorted (not open) to signal ground (not the chassis). Hope this helps.
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