Fender Twin Reverb (Blackface)

Schematic/Layout:

twin_reverb_ab763.pdf

Model/Circuit Number: AB763
Years of Production: 1963 - 1967
Era: Blackface
Configuration: Combo
Controls: Black, forward facing w/ white labels
Knobs: Black skirted w/ chrome center, numbered 1 - 10
Faceplate

Front: Normal: In, In, Bright Sw, Vol, Treb, Mid, Bass - Vibrato: In, In, Bright Sw, Vol, Treb, Mid, Bass, Reverb, Speed, Intensity - Pilot Lamp
Rear: AC Outlet, Ground Sw, Fuse (2½A), Power Sw, Standby Sw, Speaker Jack, Ex. Speaker Jack, Vibrato Jack, Reverb Jack, Reverb Out, Reverb In

Cabinet

Dimensions: 20'' x 26 1/8'' x 10 1/2''
Hardware: Large Chassis Straps 5 5/8'', 16'' Tilt-Back Legs
Handle: Black Plastic Strap
Feet: Chrome Glides
Corners: Chrome Corner Protectors

Covering Material

Tolex/Tweed: Black Tolex
Grill Cloth: Black/White/Silver

Logo: Grill mounted, raised, chrome & black script
Weight: 69 lbs.
Speaker

Size: 2 x 12
Impedance: 4 ohms
Model: Jensen C12N or Oxford 12T6 (For more info, check out the Jensen Replacement Speakers)

Effects: Reverb, Tremolo
~Watts: 85 watts
Tubes

Pre amp: 7025
Power: 4 x 6L6GC

Bias: Fixed with bias adjustment pot.
Rectifier: Solid State

Comments: Beginning in early 1966 Fender offered JBL D-120F Speakers as an ''premium upgrade'' to the Twin Reverb. Some early Twin Reverbs have tube charts specifying 7355 power tubes. It is unclear if any shipped in this configuration.