A 1967 YBA-1 is reported to feature a diode rectifier.The used tubes are, as indicated in the amp: Two 6CA7s (replaceable by EL34s) and three 12AX7As (also called 7025s or ECC83s); plate voltages have always been a question on these units, but I think this may be largely because of confusion with the YBA-1A models that run VERY high plate voltages; most of the YBA-1 models probably come in somewhere /-450 volts (one has reported 425 volts on plate, another one ca.A YBA-1 has a nominal 8 ohm output, and the two speaker jacks are wired in parallel.Runs on less than 440 volts, weighs 39 pounds Dimensions: 8"x18"x10" (HWD); weight: 40 lbs. (source: Catalog) Silvery grey grille cloth; Original layout was very close to the tweed Bassman and the Marshall JTM-45 50-watt models; noticably huge big heavy transformers are a Traynor hallmark in these units up till the approximately 1972 models; Early models were tube rectified (5AR4) and used two 7027A power tubes.Features silvery grey grille cloth Yorkville [...] owns Dyna-Bass #0011 and [has] used it as a promotional tool.
Der AC 30 Custom führt die Tradition des legendären Verstärkers fort der sein Debüt in den Sechziger Jahren feierte.
Old Bob Moog did not realize that he was a few years ahead of the amp-tweaking rack-friendly guitarist.
My favorite of all of these was the L9 model outfitted with a JBL 15 inch guitar speaker in an open back cabinet. I would say you could get a Twin Reverbesque sound plus!
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.
Peavey told me awhile back that 6 months of steady use and you should change the tubes. #2: Gibson Lab Series Used price- 0 or less These Moog designed amps were very well made and quite dependable, but probably misunderstood for its time.