1968-1981

Configuration: Piggyback
Power: 100 Watts (68-76) 135 Watts (77-81)
Effects: Reverb, Tremolo

SCHEMATICS

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

LAYOUT

• Front Panel: In, In, Bright Switch, Volume, Treble, Middle, Bass - "Vibrato" In, In, Bright Switch, Volume, Treble, Middle, Bass, Speed, Intensity, Reverb - Master Volume (72-81) - Pilot Light
• Back Panel: AC Outlet, Ground Switch, Fuse, Power Switch, Standby Switch, Speaker Jack, External Speaker Jack, Vibrato Jack, Reverb Jack, Reverb Out, Reverb In

CABINET 

• Dimensions:
  • Head: 13 x 26 x 9 
  • Cabinet: 45-1/2 x 30 x 11-1/2 
• Tolex: Black
• Grill Cloth: Blue / White / Silver w/ Aluminum Frame (68-69), w/o Aluminum Frame (70-81)
• Logo: Grill Mounted, Raised, Chrome & Black Script w/ Tail (68-75) or w/o tail (76-80)
• Handle: Black Strap (Head), 3x Black Strap (Cabinet)
• Feet: Chrome Glides or Casters (72-81)
• Corners: Chrome Corners w/ Lip
• Knobs: Black Skirted w/ Chrome Center, Numbered 1 - 10
• Hardware: Medium Chassis Straps 4 5/8''

SPEAKERS 

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

TUBES

• Pre amp:
  • Normal: 7025
  • Tremolo: 7025 and 1/2 7025
  • Phase Inverter: 12AT7 (Long Tailed)
  • Tremolo: 12AX7 (photoresistor)
  • Reverb Driver: 12AT7
  • Reverb Recovery: 1/2 7025
• Power: 4 x 6L6GC
• Bias: Fixed with Bias Adjustment Pot
• Rectifier: Solid State

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