Traynor is a brand of bass and guitar amplifiers, the first brand formed by Yorkville Sound. The Traynor brand, named for founder Peter Traynor, began in 1963 with the Dynabass bass amplifier, a rental product. Traynor first became popular in Canada by providing less expensive versions of the circuits used in Marshall and Fender amplifiers of the time. [Source: Wikipedia]

Yorkville spare parts catalog 2007

Traynor schematics

Images 1964-8 Traynor YBA-1 Bass Master and signature from Traynor Model YCV40 eBay:

1964-8 Traynor YBA-1 Bass Master amp head Peter Traynor signature amplifier