December 06, 2022, 09:04:52 AM

Author Topic: Right Channel Hum  (Read 867 times)

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Offline Paul Birkeland

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Re: Right Channel Hum
« Reply #30 on: August 24, 2022, 07:01:23 AM »
OK, in your previous post you mentioned IB, OB, and KReg being 0V.  This is on the larger C4S board, not the smaller one (it doesn't have a Kreg).

IB on the larger PC board wires into the high voltage power supply at 34U, and you need to do a DC voltage check of 34U.  If it's 0V that is significant.  If it's more like 380V and IB is 0V, then they are not connected.
Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man