Brian wrote:
Let us know what you find, this could be quite interesting.



I dug into the amp and fired it up. The lower heater voltage drops the
hum 2 dB, and only on the phono position. The signal level is not
affected, nor is the hum for high-level inputs. I had to rezero the
hum balance pot, but the net result was 2 dB change.

Brian

Well, that seems significant enough to warrant the added resistor.

Learn something new every day... another technique for the bag of tricks.

Cheers,
Fred
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