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Can you post a photo so that we can see what you did?
Hmmm. I don't see anything obvious. Except maybe one channel doesn't seem to have its shield connected. But you said you had hum even without anything connected to the inputs?jh
If I turn the power switch off the hum fades to nothing rather than abruptly stopping....To me it seems that the power supply is the source, maybe magnetic interference from the tranny?
If you switch off the device there is no magnetic fields from the transformer.First of all, I'd made the input/output RCA connections tidy. There should not be loose loops and the length should be as short as possible.
I used a little extra ground wire to have room to work. Originally I had straight wire going to the PCB untwisted. I did this to twist them. Both sounded the same.
So you are saying 1 star point for the IEC & PCB ground wire, then another star for everything else connected to the first star? And the 2 stars should be electrically separate except for the connecting wire?
With an all metal chassis, the ground wire from the IEC connector should go directly to the chassis. The audio circuit grounds should go to the chassis at the I/O jacks area. The power line ground is not of the audio circuit ground system although both are connected to the same metal chassis.Once again Bill Whitlock has detailed troubleshooting procedures.
Congratulations! In what position do you use the 6N2P?
Have you checked the resulting RIAA (either by measurements or by listening)?
It is the first time in my practice that a tube is involved in hum, not noise.
6N2P has internal screen, which can be grounded and improves external shielding and triodes inter-talk. Have you grounded the screen in your usage?
I do not have a way to measure the RIAA.
No I haven't grounded the screen. The adapter I am using has pins 5 and 9 shorted in the adapter, no connection for the tube to pin 9 and pin 5 for adapter to PCB socket removed. So running a ground wire to pin 9 should be easy. If I do that should I just run a wire to the star?
IMHO its better to connect to signal ground at bottom of R203s, C202s or R207s.
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