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



Granger M50 Plexi valve amplifier

The Granger M50 Plexi valve 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 becacme a rock legend, but only MORE! Capable of providing one of the most accurate recreations of Van Halen's early tone (as demonstrated in the YouTube video), 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 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 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. The preamp consists of 3 ECC83S valves and power is rectified our own Premium Rectifier board (UF4007 diodes) to produce a punchy, tight powerful 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 valves 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 for serious 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. The 1x12 combo features a Warehouse Guitar Speakers Liberator 80 speaker. The 2x12 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 valve amplifier. Click for enlarged view.

Granger M50 sound clips

Granger M50 YouTube videos

NEW! M50 Plexi with X-Gain Mod
Granger M50 Plexi (stock) features:

* Handcrafted in USA
* ClassicTone US-made transformers
* Turret board wiring
* Output (RMS): 50 watts
* Preamp valves: 3 x ECC83S
* Power amp valves: 2 x EL34
* 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 (head)*
* Dimensions: 24"H x 20"W x 9"D (1x12 combo)
* Dimensions: 23"H x 32"W x 10.5"D (2x12 combo)
* Weight: 32 lbs. (head)
* Weight: 54 lbs. (1x12 combo)
* Weight: 75 lbs. (2x12 combo)

* Custom Cover ($50)
* Tolex/Piping Change ($25)

Click to see Tolex and Grill cloth colors

Additional (No charge) options (please specify in special instructions field when ordering):

* No PPIV Master Volume
* JJ E34L, 6CA7, or KT77 output valves

Please specify options during ordering, or contact us within 7 days after placing order. Want custom features? Email us for a quote!

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


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BASE PRICE: $1679 US (1x12 COMBO)

I have read the Purchaser & User agreement.

BASE PRICE: $1779 US (2x12 COMBO)

I have read the Purchaser & User agreement.

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 2007-2016 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, Lightning builds, Epiphone Valve Junior 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, m50, m45, g50, dragonfly, marshall, fender, jtm45, jmp, jcm, superlead, plexi, 15 watt, 18 watt, 40 watt, 50 watt, 50 watt, single ended, 5E3, bassman, matchless, trainwreck, epiphone valve junior, blackheart, tweed, deluxe, curt granger, birmingham alabama