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In Reply to: RE: hum from new tube posted by scruffy_ on February 07, 2017 at 16:26:42
There's only so much you can do in hopes that it is not defective.
Try cleaning the tube pins. Also clean and tighten the socket claws in the voltage stage.
If that doesn't work maybe it does need some hours on it as suggested.
So leave it in the output stage for awhile and then try switching back.
The hum is coming through the speakers?
If not, and it's mechanical, can you supreme the hum by putting some light pressure on the tube?
"I know just enough to get into trouble. But not enough to get out of it."
Edits: 02/07/17Follow Ups:
"Humility is the true mark of genius. Just get used to it."
In addition to what Jonesy suggests also have a look at the solder connections to be sure they are good. Reheat / reflow if there is doubt.
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