In 1963 Fender redesigned nearly its entire amp line. The revised Bandmaster, still a piggy-back design and designated circuit AA763, was introduced in November 1963 and was shortly thereafter refined into the ubiquitous AB763 circuit.
The early AA763 and AB763 blackface Bandmasters were caught in the transition from smooth blonde tolex with gold sparkle grill cloth (Nov. 63 to July 64) to black tolex with silver metallic grill cloth (Aug. 64 to Aug. 67). In August 1967, Fender changed the cosmetics once again, this time to the silverface style. The earliest of these (Aug. 67 to July 68) had aluminum grill trim, black vertical lines on the control panel, and a highly textured version of the famous silver/blue sparkle grill cloth.
In addition, the speaker cabinet was enlarged and ported. In June 1968, the Bandmaster was given the infamous AC568 silverface circuit.
- 1963 -1967 blackface Bandmaster circuits AB763
- 1968 -1975 silverface Bandmaster circuits AA763, AB763, AC568, TFC-5005
- 1968 -1978 silverface Bandmaster Reverb circuits AA768, AA568, AA1069, or TFL5005
- 1988 -1980 silverface Bandmaster Reverb Master volum 45w and 70w
AA763/AB763 Blackface Bandmaster (Seen from behind, V1 is to the right side):
- V1 12ax7 = Preamp normal channel
- V2 12ax7 = Preamp vibrato channel
- V3 12ax7 = Vibrato
- V4 12at7 = Phase inverter
- V5 6L6 = Power tube #1
- V6 6L6 = Power tube #2
- Head Cabinet: 8″ x 24″ x 9″
- Speaker Cabinet: 21″ x 32″ x 11½” ~ 1963-1967
- Speaker Cabinet: 29½” x 40″ x 11½” ~ 1967
The Bandmaster came with many different circuits during the blackface and silverface eras. The blackface head had a diode recifier, one normal channel and a vibrato channel with no reverb. The silverface Bandmaster amps got a 5U4GB tube rectifier and the vibrato channel got reverb. Hence, the name “Bandmaster Reverb”. Due to this the silverface Bandmaster Reverb is less powerful, has less attack and breaks up earlier than the blackface Bandmaster.
As usual the later silverface models were modified to become cleaner and more powerful. The 70W model from 1978 with master volume and push/pull boost had a huge power transformer and big filter caps. It reminds us more of a classic 80w Twin Reverb than a Bandmaster Reverb, and it shared its circuit design with the Pro Reverb and Super Reverb at that time.