My complete YBA-1 Bass-Master amp mod details:
Traynor Tweaks PDF File - Final revision 12

Audio samples of my modified YBA-1 Bass-Master amp:
WAV clip with Les Paul (approx 3MB)
WAV clip with Stratocaster (approx 3MB)

From the PDF... New Introduction July 2007:

The material below was formerly a website called Traynor Tweaks. After several years of maintaining it
I decided to condence it into a PDF document that could be shared easily among those interested.
My interestes have changed over the years and while I still respect the Traynor amps, I have new
goals for tones and amp performance... namely older tweed and Valco-made amps.  I recently sold this
amp and the buyer said it was one of the best amps he ever played though. So, this document is what
remains of the ol' Traynor Tweaks page. I hope you might find some parts useful.

Contents (c) 2007 Sean Kilback
Please don't reproduce or post anywhere without permission, thanks.