Peavey t 40 dating
One [channel] sounds kind of like a "bright" channel and one sounds regular Two 6CA7/EL34 power tubes, three or four 12ax7s, solid state rectifier; hand wired, very high quality work, simple easy-to-modify circuit; larger [than the ones used in the Bass-Master YBA-1] 50-watt Hammond transformer (7 lbs.); Often operated with 4 ohm loads; best used with an eight ohms cab Runs on 540 volts, weights 54 pounds - bigger transformers [than the YBA-1] Dimensions: 8"x18"x10" (HWD); weight: 40 lbs.? (source: Catalog) Early [Bass-Master] Mark IIs have the (noisy) fan mounted on the end [in the cabinet side], later [Bass-Master] Mark IIs (with lift-off top, and the reflector 'Traynor' logo) have it mounted in the back [center]; Silvery grey grille cloth; Can exceed 600 volts on plate; expect about 550 volts, if you're lucky (one has eported 537 volts on plate) Early models are identical in appearance to the Voice Master/Signature.I have swapped out the 4M volume pots for 1M, and put a 47K resistor in the NFB loop.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 3 used, bad price, amp in average (5/10) condition, Song Bird Music, Ottawa, Canada, summer 1998 US 5 [used], needed a little work but playable, cheap buy US 9.99 [used], seen at September 1998 CAD 9 [used], good condition, seen at Used Music, Ottawa, September 1998 CAD 0 [used], shabby condition, very early (pre October 1966) wrap-around type case model with tube rectifier, seen at Used Music, Ottawa, September 1998 CAD 5 [used], ca.
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.
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 0 used, together with a mathing used 4x12 cab, bought at a pawn shop, October 1998 CAD 0 [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). ] 0 [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.