On Sun, Nov 7, 2021 at 02:44 AM, Richard Merifield wrote:
> ...
> I measured the voltage at the R40/R31/R30 junction at 132V DC and -5.8V and -5.3V on the other side of R30 and R31 respectively
> with respect to chassis ground. Why would R30 get twice as hot as R31 given those measurements?
> Don't they effectively have almost the same current flowing across them ? I desoldered R30 and it measure 3.1kOhm but
> perhaps something else is wrong with it ?
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There could be an AC voltage difference, RMS voltage on the resistors could be different. If you look at the voltage at two terminals of C12 with respect to ground with an oscilloscope (using a probe that can work at those voltage) what do you observe? When the circuit is perfectly balanced and C12 is doing its job AC voltage at two ends of C12 (on R30/R31) should be small. Ideally zero volts if everything was perfectly balanced but there will be some AC because of mismatches.
Ozan
