Dating fender bandmaster reverb
"Blonde" aficionados feel this circuit has superior tonal characteristics when overdriven, to the AB763 circuit.The 6G7 and revised 7-A circuit used the long-tail pair phase inverter introduced with the 1957 Bassman, used a solid-state rather than a tube rectifier, and also included a vibrato that is heralded as Fender's best by many enthusiasts. The new model was covered in Tolex rather than "tweed;" still a combo in brown Tolex for 1960, and then a blonde-covered head-and-cab piggyback 1961-63.The 6G(n) ("brownface") circuit was used in several Fender amplifiers, including the Bandmaster.until July 1963 when the "AB763" circuit was introduced.Fender frequently releases limited editions of the Blues Junior.
It is aimed at achieving the warm, tube-driven tone common in many styles of American blues and blues rock dating back to the 1950s, while remaining both portable and affordable.
The first Bandmaster was in all respects almost identical to the Fender Pro, a dual-6L6 26-watt amp with a 1x15 speaker, with one difference: separate treble and bass controls, where the Pro like all other Fender amps to that time only had a single "Tone" knob.
Like the other larger Fender amps, the Bandmaster used cathode-biased 6L6G output tubes, a 6SC7 paraphase inverter, and two more 6SC7s in the preamp with a 5U4 rectifier.
Unfortunately, the tube chart inside the amp head cannot be reliably used to differentiate the AB763 from the later circuits, as Fender continued using the older tube charts for a while after changing the circuit configuration.
Some of the changes from the AA568 were reverted in October, 1969, yielding the AA1069 circuit, but many of the changes remained in place.
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Later "silverface" amps retrofitted to this circuitry are described as having been "blackfaced," a reference to the black faceplate used on these amps during much of this era.