Model/Circuit Number: 6G7-A
Years of Production: 1961 – 1963
Controls: Brown forward facing w/ white labels, controls numbered 1 – 10
Front: Normal: In, In, Vol, Treb, Bass – Vibrato: In, In, Vol, Treb, Bass, Speed, Intensity – Presence – Pilot Lamp
Rear: Ground Sw, Fuse (3A), Power Sw, Standby Sw, Speaker Jack, Ex. Speaker Jack, Vibrato Jack
Head: 8 1/2” x 24” x 9” ~ 1961
Speaker Cabinet: Ported Tone Ring, 21” x 30” x 111” ~ 1962-1963
Speaker Cabinet: Sealed, 21” x 32” x 111”
Hardware: Large Chassis Straps 5 5/8”, Side Bar Clips, 16” Tilt-Back Legs, Thumb screws, Thumb screw receptacles
Handle: Brown Plastic Strap or Black Plastic Strap Handle ~ 1963-1964
Feet: Chrome Glides
Corners: Chrome Corners with Lip
Rough Blonde Tolex
Oxblood Grillcloth ~ 1961-1962, Beige Brown Grillcloth ~ Late 1962-1963
Logo: Flat Brown Logo
Size: 1 x 12 ~ 1961, 2 x 12 ~ 1962-1963
Impedance: 8 ohms ~ 1961, 4 ohms ~ 1962-1963
Model: Jensen C12N, Oxford 12K5R-1, Oxford 12M6-4, Oxford 12L6N-12(For more info, check out the Jensen Replacement Speakers)
The Fender Bandmaster evolved from a 1×15 combo in the early 50s to a 3×10 combo in the mid to late 1950s. In 1960, the vertical chassis, tweed covered Bandmaster gave way to a horizontal chassis, Tolex covered Bandmaster. The model (6G7) retained the 3×10 speaker configuration, but had a completely different circuit than the tweed versions. The 3×10 Tolex Bandmaster was very short lived and by late 1960 the amp received an updated tremolo circuit and was produced as a piggyback amp with separate head and speaker cabinet instead of a combo amp (model 6G7-A).
The earliest 6G7-A Bandmasters used the same 8 ohm output transformer as the brown Pro Amp since the speaker cabinet had a single 8-ohm 12 inch speaker. The 1×12 cabinet used a double baffle ported reflex design.
By late, 1961 Fender dropped the 1×12 ported cabinet in favor of the 2×12 infinite baffle (sealed) enclosure as used on the blonde 6G9-A and 6G9-B Bassman amps. The output transformer was, naturally, changed to 4-ohm unit with the change to the 4-ohm 2×12 cabinet. It is interesting to note that the Concert, Bandmaster, and Pro all have nearly identical circuits. The major difference is in the output transformer and speaker configuration.