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A 1967 YBA-1 is reported to feature a diode rectifier.
"NO RESERVE" OVATION EARLY 80'S HARDSHELL CASE "NO RESERVE" THIS OVATION HARDSHELL CASE IS FROM THE EARLY 80'S. THIS EARLY 1980'S OVATION HARDSHELL CASE IS IN NICE SHAPE!
I am working on posting the RCA HB-3 Tube Handbook on line on this site (on it's own page).
I've also posted Sylvania tube manuals on their own page.
437 volts); this may have gotten higher after 1971, but into the summer of 1971 I'd expect the plate voltages on 6CA7s to be down substantially from the YBA-1A; have the chassis sliding-in ala Fender.
Last versions have that easily identified rubber and 'chrome' molding running around each end of the head cabinet; mine is from 1971 and is this last version; 1972 models have no choke; [a 1978 is] black with the black plastic fabric and [has] the baby bumper trim, [it has] two 6CA7 and three 12AX7A tubes in it [and] no fuse holder, just a red reset button I put Mullard EL34s in my YBA-1.