Thanks for your advices, I owe you a couple beers, too bad indonesia is so far...
Grounding the RCA to the casing improved the hum by approx 30% (thanks!), not gone though, still pretty audible
So I started by making sure the wire was well twisted, I moved the resistor to the RCA input (far from the lamp) and no change...
I switched the lamps, swiched the speaker cables, checked the speaker,
I then lost it and redid the entire preamp/6n9p section... STILL HUMS... this is driving me crazy..
It sounds like a 60 hz hum... can this happen in DC or should I look on the power supply side.. even thought the hum is unilateral?
Grounding the RCA to the casing improved the hum by approx 30% (thanks!), not gone though, still pretty audible
So I started by making sure the wire was well twisted, I moved the resistor to the RCA input (far from the lamp) and no change...
I switched the lamps, swiched the speaker cables, checked the speaker,
I then lost it and redid the entire preamp/6n9p section... STILL HUMS... this is driving me crazy..
It sounds like a 60 hz hum... can this happen in DC or should I look on the power supply side.. even thought the hum is unilateral?
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