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In Reply to: RE: hum from new tube posted by scruffy_ on February 07, 2017 at 14:46:30
Strange story but true. My Sherwood, when I put new linestage tubes it hums for about 10 hours then the hum starts to disappear.
run it for a few hours and see if the hum diminishes. If not see if the hum follows a particular tube or try putting back your old tubes to see if it's not the amp humming.
Follow Ups:
I identified the tube and I placed it into output stage instead of the voltage stage. That eliminated the hum, but I really got these tubes for the voltage stage of my preamp.
~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Humility is the true mark of genius. Just get used to it."
-Anonymous
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?
Cheers!
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Edits: 02/07/17
~~~~~~~~~~~~~~~~~~~~~~~~~~~
"Humility is the true mark of genius. Just get used to it."
-Anonymous
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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