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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.

These mods are worth doing to any Signature/Bass-Master, IMO.

Sound Just like a plexi 50 watt Marshall (when used for guitar); Punk or loud rock (or with channel bridging Entwistle's bass sound) (when used for bass) Better sound as a Fender Bassman (bass and guitar); lower powered, would work just fine in a blues or lower volume setting (?

I have swapped out the 4M volume pots for 1M, and put a 47K resistor in the NFB loop. Professional repairman required, although schematic is included, weird defects possible. The YBA-1 serial number is 8011108 the YT-15 serial number is 7125596.

These mods are worth doing to any Signature/Bass-Master, IMO. CAD $253 used, bad price, amp in average (5/10) condition, Song Bird Music, Ottawa, Canada, summer 1998 US $125 [used], needed a little work but playable, cheap buy US $299.99 [used], seen at September 1998 CAD $189 [used], good condition, seen at Used Music, Ottawa, September 1998 CAD $150 [used], shabby condition, very early (pre October 1966) wrap-around type case model with tube rectifier, seen at Used Music, Ottawa, September 1998 CAD $115 [used], ca.

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.) loud as hell class A circuit so there is little distortion, sounds very punchy and clear very mechanical sounding; SRV and Hendrix heads need not apply.If you are looking for something original sounding and with a good bit of style, this is it (if you can find one)!] 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.

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