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Prosonic with frying noise

10/16/2003 2:43 PM
Albert Kreuzer
Prosonic with frying noise
I have a Fender Prosonic combo on my bench which is quiet for a while when cold. After warm-up it will make loud frying noises. It appears on both channels with the volume / resp. gain ctls down. I have narrowed it down to V2a and the tone stack (no noise w/all tone ctls down), but now I'm stuck.  
 
Here is what I have done so far:  
changed V2  
changed R17 (plate resistor)  
changed R18 (slope resistor)  
 
Here is a section from the schematic:  
http://www.albertkreuzer.com/pics/el/prosonic_detail.GIF  
 
Has anybody had this problem before? Any help greatly appreciated.  
Thanks in advance  
 
Albert

 
Replies:
Wild Bill Albert, frying noise often comes fr... -- 10/16/2003 3:29 PM
Enzo was about to suggest freeze spray t... -- 10/16/2003 11:39 PM
Albert Kreuzer Thanks Enzo & Wild Bill, at the mom... -- 10/17/2003 3:02 PM
Albert Kreuzer Same noise, plus hum and oscillations - HELP! -- 11/5/2003 8:58 PM