M50 Plexi amplifier

Inspiring, unforgettable tone can be yours! The Granger M50 Plexi vacuum tube amplifier is our flagship model. The M50 Plexi is a hand-wired reproduction of the legendary late 60’s/early 70’s 50 watt amp that became a rock legend, only more!

Capable of providing one of the most accurate recreations of Van Halen’s early tone (as demonstrated in our product videos and audio clips below), as well as Allman to Zeppelin – classic tones that defined a musical revolution – it’s all here. The controls are classic. There are no footswitches, internal relays, or other signal-robbing components. It is based on tried and true circuitry, years of actual gigging and tweaking the circuit, 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 (gain) control. A (post phase inverter) master volume (based on Ken Fisher’s Type II design) is standard on the amp. 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, without the extreme bass frequencies that muddy up the tone. The preamp consists of 3 ECC83S valves and power is rectified with UF4007 diodes to produce a dynamic, yet tight low end.

The power section runs on two EL34s which produce over 50 watts when fully overdriven. Other output tubes can be substituted during ordering (see below). For the service-minded player, an external bias adjustment with low voltage test points allows the user to bias the amp when replacing tubes without removing the chassis (standard feature, only requires removal of the back panel).

X-Gain and our Ultimate FX Loop are now standard on every amp! X-Gain allows the two channels to be cascaded (switched from parallel to series) for modern 80’s type gain (Randy Rhoads, George Lynch, etc.), while our Ultimate FX Loop provides the use of external effects after the gain stages, with zero-loss. We also offer an option for traditional (black) turret board wiring, choice of front logo, and an expedite order option to move your order to the top of our build queue.

The 1×12 combo features a Warehouse Guitar Speakers Lead 80 speaker. The 2×12 combo features (1) Warehouse Guitar Speakers Veteran 30 and (1) WGS ET65 speaker. Other speaker options are available upon request. Custom options include tolex & piping changes, and a custom cover with the Granger logo.

Granger M50 Plexi (stock) features:

  • Handcrafted in USA
  • Hammond/Heyboer transformers
  • Printed circuit board wiring (through-hole plating)
  • Output (RMS): 50 watts
  • Preamp valves: 3 x ECC83S/12AX7
  • Power amp valves: 2 x EL34/6CA7
  • UF4007 diode rectification
  • Presence control
  • Bass, Middle, Treble controls
  • Volume 1 (bright channel)
  • Volume 2 (normal channel)
  • X-Gain (Push-Pull on normal channel)
  • Post-PI Master Volume
  • Ultimate FX Loop (zero-loss)
  • 4/8/16 ohm impedance selector switch
  • Carling switches
  • Cliff input jacks
  • Cliff output jacks
  • “Plexi” control knobs
  • Chassis external Bias test and adjust
  • Dimensions: 26″W x 10-1/4″H x 8″D
  • Weight: 32 lbs.

Also available in 1×12 combo and 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

Clip 4

Clip 5 – Strat

Clip 6 – Clean

Pricing and Options


Output Tubes *

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 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

Piping *

Additional Controls *

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