Conrad-Johnson PV-10B: Low-level Hum

Tubes Asylum

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Spending a bit more time with this preamp (my brother's PV-10B) to help troubleshoot issues, there's a large channel output imbalance, but there's also a low level hum.

60Hz line hum coming through the power supply?

The unit is pretty simple. There's one 4700uf 35V electrolytic capacitor in the power supply (the preamp only has two other electrolytics, both of small value, and all the other capacitors are not electrolytic). I'm hypothesizing this is a power supply issue, and related to filtering. I swapped the linestage tubes to see whether it may be a tube issue. Hum was still there.

Thoughts?

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Topic - Conrad-Johnson PV-10B: Low-level Hum - tvr2500m 17:07:09 09/25/23 (2)

RE: Conrad-Johnson PV-10B: Low-level Hum - dericmc@live.com 11:01:50 11/08/23 (0)

RE: Conrad-Johnson PV-10B: Low-level Hum - Triode_Kingdom 18:08:40 09/25/23 (0)

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