point to point wiring Power 45 Watts RMS @ 8 Ohms Comments This was an all-new design although features and tube compliment were same as the YBA-1.
Also, the earliest transistor-based amps were indeed rather awful (at least, any time distortion was introduced) and that first impression seems to have been a lasting one.
1968 Traynor YSR-1 Custom Reverb Guitar Amplifier, Serial Number 70403.
Dimensions: Approx 23¾" W x 11¼"D x 8½" H x 42.5 lbs.
on a Bass-Master might indicate that the amp is from 1965 or 1966, before the four-digit serial numbers were used.
The circuit in [that amps] is built on a phenolic turret board instead of the Fender style fibre board used [later.] [...] it appears that Traynor/Yorkville used three digit serial numbers up until 1968.
By the end of 1963, Traynor was selling the Dynabass amps along with matching 15-inch speaker cabinets, as well as Traynor portable columnar public address (PA) speakers and its associated 15-inch speaker cabinet became the "YS-15".