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



Granger M502 Solo Plexi valve amplifier

The Granger M502 Solo Plexi valve amplifier is hand-wired, all tube, inspired by the famous 50 watt master volume amps of the late 70's and 80's, but with two master volumes which are foot-switchable. All the classic tones that defined over a decade of hard rock anthems, with the ability to switch to a solo volume and back to a normal volume. The controls are simple - Presence, Bass, Middle, Treble, Preamp (gain), Master Volume, and Solo Volume. The preamp consists of 3 ECC83S valves and power is rectified by our own Premium Rectifier board (UF4007 diodes) to produce a punchy, tight powerful low end. The power section runs on two EL34 which produce well over 50 watts when fully overdriven. 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 (standard feature, only requires removal of the back panel). Custom options include Ultimate FX Loop, passive effects loop, tolex & piping change, and a custom cover with the Granger logo.

Granger M502 Solo Plexi valve amplifier. Click for enlarged view.

Granger M502 sound clips

Granger M502 Solo Plexi features:

* Handcrafted in USA
* Custom US Made Power and Output transfomers
* 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
* Preamp
* Master Volume
* Solo Volume
* 4/8/16 ohm impedance selector switch
* Carling switches
* Cliff input jack (1)
* Cliff footswitch jack (1)
* Cliff output jacks (2)
* "Plexi" type control knobs
* Chassis external Bias test and adjust
* Dimensions: 26"W x 10-1/4"H x 8"D
* Weight: 34 lbs.

* Ultimate FX Loop ($100)
* Passive Effects Loop ($25)
* Custom Head 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):

* JJ 6CA7, E34L, or KT77 output valves

Please specify options during ordering, or contact us within 10 days after placing order. Want an option that's not listed? Email us!

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, 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, m502, 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