Ampeg amplifier dating

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.

Reliability It's a risky proposition for repairs Old and still going strong Price I bought my YBA-1A [used] about 15 years ago for USD.

[...] The 2nd [used] one I bought off ebay [for] 5 USD was totally moded for guitar with extra pots on the back [...].

) 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)!

437 volts); this may have gotten higher after 1971, but into the summer of 1971 I'd expect the plate voltages on 6CA7s to be down substantially from the YBA-1A; have the chassis sliding-in ala Fender.

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.

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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.

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.

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 (?