Dating an ampeg svt classic
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.
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.
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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.
A YBA-1 has a nominal 8 ohm output, and the two speaker jacks are wired in parallel.
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