FENDER SILVERFACE DUAL SHOWMAN REVERB

Model/Circuit Number: AC568, AA270, AA769, AA768 (TFL 5000D)
Years of Production: 1968 - 1981
Era: Silverface
Configuration: Piggyback Head with Extension Cabinet
Controls: Silver forward facing w/ blue labels
Knobs: Black Skirted w/ Chrome Center, Numbered 1 - 10

Schematics: 

• Dual Showman AC568
• Dual Showman AA270
• Dual Showman AA769
• Dual Showman AA768

Faceplate

• Front: In, In, Bright Sw, Vol, Treb, Mid, Bass - Vibrato: In, In, Bright Sw, Vol, Treb, Mid, Bass, Speed, Intensity, Reverb - Master Vol (72-81) - 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: 13 x 26 x 9 (Head) 45-1/2 x 30 x 11-1/2 - Sealed (Cabinet)
• Hardware: Medium Chassis Straps 4 5/8''
• Handle: Black Strap (Head) x3 Black Strap (Cabinet)
• Feet: Chrome Glides or Casters (72-81)
• Corners: Chrome Corners with Lip

Covering Material

• Tolex/Tweed: Black
• Grill Cloth: Blue / White / Silver w/ aluminum frame (68-69), w/o aluminum frame (70-81)

Logo: Grille Mounted, Raised, Chrome & Black Script w/ Tail (68-75) or w/o tail (76-80) (head and cab)
Weight: 40 lbs. (Head) 145 lbs. (Cabinet)
Speaker Cabinet Configuration:

• Speakers/Load: 2 x 15" / 4 ohms (8 ohms each in parallel)
• Speaker Model: JBL D-140F (For more info, check out the Mojotone Replacement Speakers Field Guide)

Effects: Reverb, Tremolo
Watts: 68-76: 100 Watts, 77-81: 135 Watts
Tubes

• Pre amp: Normal: 7025, Tremolo: 7025 and 1/2 7025
• Power: 4 x 6L6GC

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

Comments:
Late seventies circuit changes included a Line Out jack, hum balance pot, and a pull boost sw.