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[...] When [the YBA-1] ran on 7027s, it was a rock machine (think Black Crows, Zep, etc.).
It probably has a bit less bottom end and more mids and highs now. It must have been one of the last YBA-1 Traynors made.
Better sound as a Fender Bassman; lower powered, would work just fine in a blues or lower volume setting (when used for bass or guitar). ] 0 [used], a 1978 YBA-1 together with a 1977 YT-15, both mint [US?
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.
I've used it regularily throughout the years, gigging throughout the Detroit area, and later in the E. A plate load of 6K8 would have essentially zero gain and probably lots of other problems.
That part of the hand-drawn schematic from 6/1971-1974 is smudged and hard to read, but it's definitely 68K.
Features silvery grey grille cloth Yorkville [...] owns Dyna-Bass #0011 and [has] used it as a promotional tool.