G50 Firestorm amplifier

The Granger G50 “Firestorm” valve amplifier is a high gain, single channel “hotrodded” supreme tone machine. Think of a modified Plexi, JCM800, or the “grail” of all tone, that late 70’s “brown sound” – you get the idea. What’s really interesting about the G50 is it’s dual role. Turn the Master Volume up and the Volume (gain) down, and you get a sweet, clean blues tone that is super responsive to the touch. Play lightly and the tone is soft and clean, but hit a note hard and it instantly jumps into liquid sustain and controllable feedback. There are no footswitches or relays – just pure all-tube tone using the finest tone-enhancing components. High and Low impedance inputs allow the guitarist to match guitars and pickup configurations. There’s also a push-pull pot on the Volume control that gives a thicker voicing in the low-mids, and slightly more gain for “thin-sounding” guitars. The preamp consists of 3 ECC83S valves and power is diode rectified by four UF4007 diodes. The power section runs on two JJ 6CA7 which produces over 50 watts when fully overdriven into saturation. For the service-minded player, an external bias adjustment with low voltage test points allows the user to bias the amp when replacing output valves without removing the chassis.

Granger G50 features:

  • Handcrafted in USA
  • Hammond transformers
  • Printed circuit board wiring (two-sided, through-hole plating)
  • Output (RMS): 50 watts
  • Preamp valves: 3 x ECC83S/12AX7
  • Power amp valves: 2 x 6CA7
  • Solid state rectifier
  • Master Volume, Presence, Bass, Middle, Treble, Volume (Gain) controls
  • Push/Pull “Fat” voicing on Volume control
  • 4/8/16 ohm impedance selector switch
  • Pointer control knobs
  • Carling switches
  • Cliff input jacks
  • Cliff output jacks
  • External bias measurement jacks
  • External bias adjustment control
  • Dimensions: 26″W x 10-1/4″H x 8″D (head)*
  • Weight: 32 lbs.

Note: All Granger amplifiers are custom built per order. Please see our Ordering page for more information and turnaround times.

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Pricing and Options


Mains Voltage *

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 *

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