It could be the power supply - if the sound is 60/120Hz, you may have a filter cap that's not grounded.
You might want to look at the B+, Vscreen and Vbias for noise. Would a DVM on VAC pick up anything useful here?
Hope this helps!
Search found 453 matches
- Sun Jun 08, 2008 7:40 pm
- Forum: Dumble Discussion
- Topic: Trouble shooting (w/clips and pics)
- Replies: 18
- Views: 1301
- Sat Jun 07, 2008 2:49 pm
- Forum: Technical Discussion
- Topic: Blackface Princeton - get the power section working hotter
- Replies: 22
- Views: 6495
Re: Blackface Princeton - get the power section working hotter
<strike>I'm a little surprised no one has mentioned the 'Stokes' mod - moving the PI up one node in the preamp power divider/filter string. Then again, I don' really know if that will produce the result you describe.</strike>
Oh - there it is ... and now I know why.
Hope this helps!
Oh - there it is ... and now I know why.
Hope this helps!
- Fri Jun 06, 2008 11:40 pm
- Forum: Garage Talk
- Topic: Those nifty layout drawings
- Replies: 10
- Views: 2861
Those nifty layout drawings
Sorry if this question has been answered too many times, but it wasn't in the FAQ, and searches on Drawing, CAD, Schematic and Layout returned either nothing or too much not-what-I'm-looking-for-to-plow-through (24 pages, c'mon!) What CAD tool makes those nifty layouts I see posted here, at Ceriaton...