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

	View Thread

AC15 clone problem

7/20/1999 8:09 PM
chris	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

7/20/1999 8:09 PM

chris

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