1959-1963

Configuration: Combo
Power: 50 Watts
Effects: Tremolo

SCHEMATICS

• Vibrasonic 5G13
• Vibrasonic 6G13-A

LAYOUT

• Front Panel (5G13): "Normal" In, In, Bass, Treble, Volume - "Vibrato" In, In, Bass, Treble, Volume, Speed, Intensity - Presence, Pilot Light
• Front Panel (6G13-A): "Normal" In, In, Volume, Treble, Bass - "Vibrato" In, In, Volume, Treble, Bass, Speed, Intensity - Presence, Pilot Light
• Back Panel (5G13): Ground Switch, Fuse, Power Switch, Standby Switch, Speaker Jack, Vibrato Jack
• Back Panel (6G13-A): Ground Switch, Fuse, Power Switch, Standby Switch, Speaker Jack, External Speaker Jack, Vibrato Jack

CABINET 

• Dimensions: 20 x 25 x 10¼
• Tolex: Pinkish brown (59-61) or Rough Brown (61-63)
• Grill Cloth: Oxblood (59-62) or Beige Brown (Wheat) (62-63)
• Logo: Grill Mounted, Flat
• Hardware: Large Chassis Straps 5 5/8''
• Handle: Brown Strap
• Feet: Chrome Glides
• Knobs: Brown Barrel

SPEAKER 

• Size: 1 x 15
• Impedance: 8 ohms
• Model: JBL D-130F (For more info, check out the Mojotone Replacement Speaker Guide)

 TUBES

• Pre amp:
  • 7025
  • 5G13: 2 x 7025 (harmonic vibrato)
  • 6G13-A: 12AX7, 12AX7 and 7025 (harmonic vibrato)
• Power:
  • 5G13: 2 x 6L6GC
  • 6G13-A: 2 x 5881
• Bias: Fixed Bias, Nonadjustable
• Rectifier: Solid State

Comments: Model 6G13-A's tremolo circuit left 12AX7 unused. Some early Vibrasonics have a plugged hole in the rear panel labeled "pulse adj." located about 1½" to the right of speaker jack. As the label implies this may have been a control to adjust the waveform of the tremolo.