Quote:
Originally Posted by timmy
I'm not to sure what your saying by disconnect the speaker and trace. I do have 470m b- to chassis but there has to be another way to track this down. Different tubes nothing works and the chassis grounds at the tubes are super clean and soldered . Should there be voltage from chassis to b- , because I'm getting about 239 Vdc at those points.
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What I really meant was disconnect the speaker so you can hear the hum where it originates through the signal tracer, if you have one!
Are you reading the 239VDC using a digital meter? You might reading some stray voltages.