ampage
Tube Amps / Music Electronics
For current discussions, please visit Music Electronics Forum. New: view Recent Searches.
New: visit Schematic Hell!
The sunn still shines online!

 
Listen to great tunes streaming live right now!

ampage archive

Vintage threads from the first ten years

Search for:  Mode:  
previous: Bob I have an amp that rattles/buzzes o... -- 3/6/1998 7:56 PM View Thread

Re: 5881 problem

3/7/1998 1:13 PM
R.G.Re: 5881 problem
Three possibilities:  
(a) the tubes are bad/microphonic and they themselves are resonant there  
(b) the tubes are microphonic and not resonant, bu the case/chassis is resonant and only that frequency gets back to the tubes.  
(c) Something else in the chassis is resonant/microphonic, and getting this back to the outputs.  
 
In either case, try a new set of tubes. Even if this does not fix the problem, you're not just stuck with tubes; you'll need them eventually. You might find a kindly tech to try some new ones temporarily. If the tubes don't fix it, tighten EVERY tightenable fastener on the chassis, and then start chasing cabinet/chassis resonances.