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While I was waiting for a flight, I checked out some Chinese sites and found these pics:

woocrap1.jpg

woocrap2.jpg

This is the HV supply for the opamps and the bias supply.  This is clearly pretty dire but look at the bias supply... it's simply a voltage doubler off the input AC with no trimmer, no voltage divider, no filter at all but there is more fuckery afoot... look at those bias ballast resistors.  Can anybody decode those values?  Hint... they are not 4.7M as they should be.  🙄

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