M45 Classic amplifier

The Granger M45 Classic valve amplifier is conceptually designed for vintage tone and simplicity. If you want that vintage 60’s “Plexi” tone and the touch sensitivity those amps are recognized for, this is it – and then some. The controls are simple. There are no footswitches, internal relays, or other signal-degrading components. It is based on tried and true circuitry and rock-solid construction methods. As with some of the vintage amps of the 60s and 70s, each channel has two inputs, one high and one low impedance, and a volume control. A (post phase inverter) master volume (based on Ken Fisher’s design) can be added to achieve additional crunch at lower volumes, and at full clockwise position is effectively removed from the circuit. Each channel shares the standard Bass, Middle and Treble tone stack and Presence control. The inputs can be jumpered to utilize both channels with channel 1 being the bright and channel 2 being the normal voicing. The preamp consists of 3 ECC83S valves and power is rectified by a GZ34/5AR4 rectifier valve. The power section runs on two KT66 which produces more than 45 watts when fully overdriven into saturation. E34Ls can be substituted during ordering if you prefer more aggressive upper-mid bite. For the service-minded player, an external bias adjustment with low voltage test points allows the user to bias the amp when replacing valves without removing the chassis. Custom options include Ultimate FX Loop, passive effects loop, tolex & piping change, and a custom cover with the Granger logo.

Granger M45 features:

  • Handcrafted in USA
  • Hammond transformers
  • Printed circuit board wiring
  • Output (RMS): 30 watts
  • Preamp valves: 3 x ECC83S
  • Power amp valves: 2 x KT66
  • Rectifier valve: GZ34/5AR4
  • Presence control
  • Bass, Middle, Treble controls
  • Volume 1 (bright channel)
  • Volume 2 (normal channel)
  • 4/8/16 ohm impedance selector switch
  • Carling switches
  • Cliff input jacks
  • Cliff output jacks
  • Dimensions: 26″W x 10-1/4″H x 8″D
  • Weight: 32 lbs.

Also available in 2×12 combo.
Note: All Granger amplifiers are custom built per order. Please see our Ordering page for more information and turnaround times.

Audio Clips

Clip 1 – Les Paul

Clip 2 – Les Paul

Clip 3 – Les Paul

Clip 4

Clip 5

Clip 6

Clip 7

Clip 8 – Strat

Clip 9 – Strat

Clip 10 – Strat

Clip 11 – Strat

Clip 12 – Les Paul

Clip 13 – Les Paul

Clip 14 – Les Paul

Pricing and Options


Output Tubes *

Covering *

Black Levant (default) $0.00 Red Levant +$25.00 Orange Levant +$25.00 Purple Levant +$25.00 Plum Levant +$25.00 Dark Green Levant +$25.00 Teal Levant +$25.00 White Levant +$25.00 Ivory Levant +$25.00 Tan Levant +$25.00 Cream/Cocoa Levant +$25.00 Black Elephant +$25.00 Purple Elephant +$25.00 Red Elephant +$25.00 White Elephant +$25.00 Maroon Snakeskin +$25.00 Silver Snakeskin +$25.00 Black Snake +$25.00 Tweed +$25.00 Wine Taurus +$25.00 Vanilla Taurus +$25.00 Black Western +$25.00 Brown Western +$25.00 Brown Ostrich +$25.00 Brown Gator +$25.00 Hiwatt White +$25.00 Hiwatt Red +$25.00 Hiwatt Orange +$25.00 Hiwatt Black +$25.00 Two tone (specify two in comments) +$40.00

Piping *

Additional Controls *

Comments/Other Options



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