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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.The YRM-1 is good sounding, but not as responsive, raw, or soulful as my YBA-1. presently using the yba-1 through an old sound city 4x10 which i respeakered with 80 watters. breaks up like a champ when driven and sings sweetly when i turn down the pickup volume(s). It's a beautiful computer-drawn schematic, but an error was made in transcribing the previous schematic.My personal opinion is that the YBA-1 is better for guitar, while the YBA-1A is preferable for bass. [...] typically playing a new gibson les paul "faded" through them. I got it brand new back in the late 1960s (I traded a dealer my Fender Super reverb even for it). It can be heard on all my recordings, and you can [see] me using it in the videos of my band, Terrain. Specifically, R36 needs to be 68K, not 6K8 as written.] 0 [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.This must have been one of the last real Traynor amps made... Also, my YBA-1 sounds great at all volumes, including low setttings. 1965 or 1966 YBA-1 Bass-Master (old wrap-around style case), logo 1965 or 1966 YBA-1 Bass-Master (old wrap-around style case), front view, angle 1965 or 1966 YBA-1 Bass-Master (old wrap-around style case), front view 1965 or 1966 YBA-1 Bass-Master (old wrap-around style case), back view 1966 YBA-1 Bass-Master, chassis 1966 YBA-1 Bass-Master, wiring 1968 YBA-1 Bass-Master (serial number 2xxx), front view, angle 1968 YBA-1 Bass-Master (serial number 2xxx), front view 1968 YBA-1 Bass-Master (serial number 2xxx), logo YBA-1 Bass-Master, catalog page YBA-1 Bass-Master, catalog page YBA-1 Bass-Master, schematic 10/1966 YBA-1 Bass-Master, schematic 6/1971-1974 YBA-1 Bass-Master, schematic 5/1974 - Please note: This schematic has a serious error in it.More power and punch than Fender, less ruggedness than Marshall.
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.The 2nd one I bought [...] was totally moded for guitar with extra pots on the back and stock EL34s. I [...] have [an YBA-1A Mark II amp] that goes with [the YT-15 cabinet] and it's all sounds great. i believe, though i am not sure, that these 1a's operate in class "a". Other than the old no ground power cord and serious shocks and buzz it sounded better than what i was using.