Necks were contoured from hard maple, peg holes drilled, tops and backs formed-sanded, ribs bent and bass bars installed on tooling either made for or developed under direction.
Presses for installing the bass bar, and the heating forms used to laminate the tops and backs of the instruments were made in-house.
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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.