Dating silvertone amp
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.
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.
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.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.Features silvery grey grille cloth Yorkville [...] owns Dyna-Bass #0011 and [has] used it as a promotional tool.Sound - Reliability - Price CAD 5 [used], condition unknown, Scarborough, Ontario, Canada, February 7, 2001 Very hard to find. Dyna-Bass, front view, angle (apparently the same as the following) 1963 Dyna-Bass, serial number 0011, front view, angle Features Two channels, deep (bass), and bright (guitar); each has an attenuated and a normal gain input (like the old Marshalls); no reverb Volume control channel one, channel two; treble, bass, low range expander, high range expander (passive); the low range expander may sound like a mid-range, the hi range expander may sound like presence (on Marshalls or Fenders) to some (the section is a virtual clone of that of the Marshall JTM-45); standby switch; pilot light; ground and on/off switch; no fan One main speaker output, impedance is not indicated (runs fine using a cab of eight ohms, also often operated with four ohm loads), one "extension" speaker output also without indicated impedance.