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[...] When [the YBA-1] ran on 7027s, it was a rock machine (think Black Crows, Zep, etc.).

If you are looking for something original sounding and with a good bit of style, this is it (if you can find one)!More power and punch than Fender, less ruggedness than Marshall.I'd say its closer to a Vox type sound, but if you want Vox sound, this will not suffice.Sound It's got the best tone, but it's not the loudest (when used for bass). Both the YBA-1 and YSR-1 each have 4 input jacks, so I can jumper the channels and use both the bright and normal volumes to adjust my tone. 1966 early model, cosmetically it's in pretty good shape, the tolex is perfect, the grill has two tiny snags over at one end, but it seems this amp may have fallen face first at some time, when i got it there were only two of the 'chicken head' knobs, and the front panel screw holes were stripped, so you could just pull it off; there's no dents or anything in the faceplate, not even a scratch, internally it's perfectly clean, no dust or gunk anywhere, recently, [October 1998] CAD $230 used, together with a mathing used 4x12 cab, bought at a pawn shop, October 1998 CAD $200 [used], seen at Used Music, Ottawa, November 1998 [US?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). ] $100 [used], a 1978 YBA-1 together with a 1977 YT-15, both mint [US?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.

[Oct 2002] US $120 used; one can be bought for under [US] $200 - a total bargain US $150 [used], needed a little work but playable, cheap buy US $199 used, you can get one cheaper CAD $300 [used], good condition, seen at Songbird Music, Ottawa, November 1998 (since January 1999 though, it had changed its condition to 'very good') Rating very good amp My personal opinion is that the YBA-1 is better for guitar, while the YBA-1A is preferable for bass.

My YBA-1A [...] uses 6550s and it's the best rock bass head that I've owned.

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.

] $150 [used], very early model, the serial number is 0278, which places it in 1966, uses 6CA7 tubes as specified in the tube chart, no tube rectifier, and the marshall style phenolic turret board, also, it has the hole in the chassis for the tube rectifier socket, but it is blocked with a circular steel plate, the 5 volt rectifier heater winding at the power tranny is cut about 2 inches out, December 1998 Rating Very good one. I have a 1977 YBA1 with a matching YT-15 cabinet [...]. It's probably not worth a tird as a collector's item but this amp really screams. I rate my YRM-1 second to my YBA-1, because it does not have as much balls.