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AC15 clone problem

7/20/1999 8:09 PM
chris
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AC15 clone problem
Hi  
 
In my AC15 clone(former tube pa head working cond.) i hear the guitar but very loud hum + dissonant notes.  
 
Somewhere i read this indicates your worn out old elcos need to be changed, so i did this with little or no effect.  
 
 
 
I rebuilt the preamp to top boost specs + EF86 channel connected via 330k res. and copied the PI stage, for now i left the power stage asis with adjustable balanced bias supply. Did rather a messy job point to point but more or less the way the amp was built (and worked)before.  
 
Any ideas appreciated  
 
thanks

 
Replies:
Doc Sounds like you have heavy AC rippl... -- 7/20/1999 8:24 PM