Fender Silverface Bandmaster Reverb

Model/Circuit Number: AA768, AA568, AA1069, AA270 (TFC-5005D)
Years of Production: 1968 – 1980
Era: Silverface
Configuration: Piggy-back
Controls: Silver forward facing w/ blue labels
Knobs: Black Skirted w/ Chrome Center, Numbered 1-10
Schematics: 

• Bandmaster Reverb AA768
• Bandmaster Reverb AA1069
• Bandmaster Reverb AA270

Faceplate:

• Front: Normal: In, In, Bright Sw, Vol, Treb, Bass – Vibrato: In, In, Bright Sw, Vol, Treb, Mid, Bass, Speed, Intensity, Reverb – Master Vol (76-80) – Pilot Lamp
• Rear: AC Outlet, Ground Sw, Fuse (2A), Power Sw, Standby Sw, Speaker Jack, Ex. Speaker Jack, Vibrato Jack, Reverb Jack, Reverb Out, Reverb In

Head Cabinet:
Dimensions: 13 x 25 x 9-1/2
Hardware: Large Chassis Straps 5 5/8″, Side Bar Clips

Handle: Black Strap
Feet: Chrome Glides
Corners: Chrome Corners with Lip

Tolex/Tweed:

• Black

Grill Cloth:

• Blue / White / Silver w/ aluminum frame ~ 1968-1969
• Blue / White / Silver w/o aluminum frame ~ 1970-1980

Logo:

• Grille Mounted, Raised, Chrome & Black Script w/ Tail ~ 1968-1975
• w/o Tail ~ 1976-1980 (head and cab)

Weight: 40 lbs. (Head)

Speaker Cabinet Configuration:
Dimensions:

• 39-1/4″ x 29″ x 11-1/2″ ~ 1968-1975
• 30″ x 28″ x 12″ – Sealed ~ 1976-1980

Handle: Black strap handles (x2)
Feet: Glides or Casters ~ 1972-1981
Corners: Corner protectors
Tolex/Tweed:

• Black Tolex

Grill Cloth:

• Blue sparkle grille cloth w/ aluminum frame ~ 1968-1969
• Blue sparkle grille cloth w/o aluminum frame ~ 1970-1981

Weight: 117 lbs
Speakers/Load: 2 x 12″/4 ohms (8 ohms each in parallel)
Speaker Model: Oxford 12T6, Utah 12″ (ceramic) and JBL D-120

Effects: Reverb, Tremolo
Watts: 40 Watts
Tubes:

• Pre amp: Normal: 7025, Tremolo: 7025 and 1/2 7025
• Power: 2 x 6L6GC

Bias: Fixed with bias adjustment pot.
Rectifier: 5U4
Phase Inverter: 12AT7 (Long Tailed)
Tremolo: 12AX7 (photoresistor)
Reverb Driver: 12AT7
Reverb Recovery: 1/2 7025

Comments:
The 40″ x 29-1/2″ x 11-1/2″ cab placed the speakers placed one above the other on the baffle.
The 30″ x 28″ x 12″ cab placed the speakers in the top right and lower left of the baffle. AA568 included a major change to the bias section of the power amp which was poorly received so Fender changed the model design to the AA1069 but kept much of the disliked circuitry. The aluminum trim was deleted from cabinets when the AA1069 model appeared in 1970. In 1970 a grounded AC plug and three-position ground switch were added to the rear panel.