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Apogee 18th September 2011 12:29 AM

Traynor YCV15Blue - adding bias adjustment
Hello all,

I'd like to add manual bias adjustment to my Traynor guitar amp.

The service manual that includes the schematic can be found here:

Any help would be much appreciated as I honestly don't know where to start. Suggestions of values as well as which resistors to change and how to wire the pot would be much appreciated!

I've just ordered new tubes and would rather not nuke them by making a mistake.

Thanks in advance,


kevinkr 18th September 2011 12:51 AM

:cop: Moving this to the instruments & amps thread..

Apogee 18th September 2011 01:02 AM

Thanks Kevin!

Sorry about posting in the wrong place. Didn't realize we now have a place for musical instruments. Amazing how the place keeps growing and growing...

Best regards,


Apogee 18th September 2011 01:21 AM

While I'm asking for help, the other thing that I'd like to do to this amp is install a switch to be able to select between triode and pentode modes.

Where to install it would much appreciated.

For the record, while I've done lots of solid state amp work, I know nothing about tube amps and am trying to learn.

Thanks in advance for the help,


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