Possible indeed. At least we have some idea that some tubes are culprit to some of the noises we hear
post #1126 of 2213
5/5/09 at 2:54am
This actually makes me think it is about higher current draw.
My hotel room is a bit loud, but I can hear the very faintest buzz with volume all the way down -
Very low with 12AU7s
Slightly louder with 8416
Same with 6922
Slightly louder still with 6H30
Which would lead credence to the heater current theory..
BUT I don't recall hearing this except on a couple of tubes in the past...
runeight, did my scope pics give any clue to the hum?
also, whilst it was being scoped, i did notice the offset wanders between 0 and 3mv quite quickly, would this indicate anything unusual or is it just the behavious of the buffers and servos