I have a slight problem here with hum. I got a new VTA70 last week, and it was extremely quiet when I started it up. It started to hum a little (ears near the speaker) but then it started to get a little worse.
So -- I turned the bias pots all the way counterclockwise, and put a new rectifier in to test that (the rectifier is new to me, anyway -- it's a Sovtek 5AR4 with a date code of 06 04).
At this point, I had not turned the amp on at all today. So I turned it on and the fuse blew. Unfortunately I don't have any more fuses, and it's too early here to go get some.
What I was wondering...has anyone else had this experience? I suppose the new rectifier could be bad, but I have no way to test it.
I would normally write Bob about this, but his email is bouncing and I'm going to leave town in a few hours.
Last edited by dougmon on Fri Dec 13, 2013 10:07 am; edited 1 time in total (Reason for editing : additional info)