Welcome to Granger Amplification. We manufacture high performance vacuum tube amplifiers.



Granger G50 Firestorm valve 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 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 valve amplifier, in two-tone head cabinet.

Granger G50 Firestorm demo video

Granger G50 features:

* Handcrafted in USA
* US made ClassicTone transformers
* Turret board wiring
* 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 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.

* Ultimate FX Loop ($100)
* Custom Head Cover ($50)
* Tolex/Piping Change ($25)

Click to see Tolex and Grill cloth colors

Additional options (please specify in special instructions field when ordering):

* JJ KT77 or EL34 output tubes
* Pointer head or "Plexi" type control knobs

*NOTE: Due to layout requirements, multiple options such as VariWattage and TBFX require the use of our larger 100W chassis and head cabinet.

Please specify options during ordering, or contact us within 10 days after placing order.

Please see our current turnaround times before ordering! Each amp is custom built to order.


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Prices subject to change without notice. Orders already in progress are not subject to price changes. Granger Amplification reserves the right to make any product design changes without notice or obligation to incorporate these changes in products previously purchased.

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All content copyright 2007-2014 by Blue Nite Productions. grangeramp.com is the website of Granger Amplification, a company that builds quality, custom amplifiers, one at a time, at very reasonable prices. Our focus is on producing all-tube, hand wired amplifiers based on proven designs such as vintage Marshall and Fender products, and other boutique amps, while charging a fair price. We also do kit building, modification, and repair work. We specialize in Plexi recreations, custom, boutique amp builds, and custom mods. All trademarks are owned by their respective companies and are only used herein for historical references. - guitar amplifier, amplifier, guitar, amp, amps, builder, for sale, fs, repair, mods, hand, wired, tone, custom amp, custom amps, amp mods, modifications, amplifier, handwired, point to point, tube, vacuum tube, valve amp, kit build, amp kits, made in usa, d18, e35, m45, m50, g50, cg50, lead overdrive 100, dragonfly, marshall, fender, jtm50, jmp, jcm, superlead, plexi, 15 watt, 18 watt, 35 watt, 36 watt, 45 watt, 50 watt, 100 watt, single ended, push pull, 5E3, bassman, matchless, trainwreck, express, epiphone valve junior, blackheart, tweed, deluxe, curt granger, birmingham alabama