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



The Fender Hot Rod Deluxe is one of the best selling amps of all time, and with our mod kits, can be made to live up to it's full potential with just a few dollars and a few minutes of work. We now offer TWO mod kits - our popular HRD Mod Kit, and the new, Premium HRD Mod Kit. Our mod kits include all the necessary parts and detailed instructions. Only basic soldering skills and the ability to identify a few components on the included PCB layout are required. With the mod kits, the following will be improved or corrected:

  • Clarity improvement on both Normal and Drive channels
  • Better master volume usability
  • Reduced attenuation on Drive channel
  • Improved reverb performance
  • Tightened low end response/less "flabbiness"
  • Better reliability

With the Premium HRD Mod Kit, clarity, transparency, punch, note definition, and sustain are all improved. The Premium kit includes the standard HRD Mod Kit, plus a WGS ET65 8 ohm speaker (65 watt), a matched pair of JJ 6L6GC, and three JJ ECC83S/12AX7 tubes.

Our customers love this mod kit and what it does for their amps! Read the feedback we've received.

Notes: Performing these modifications WILL void the warranty on your amplifier. Working on amps can be deadly if you do not take proper precautions. Follow the instructions very carefully. Basic soldering skills are required. If you are at all unsure of your ability to perform these modifications STOP and take your amp to a professional to be modified. You can also send your amp to us for modification. Contact us for pricing. *Standard shipping rates are shown. All our shipping vendors (USPS, UPS) have recently increased their rates for International Shipping. The shipping calculator will charge a fixed price, and we will invoice you any difference before shipping the product. Granger Amplification LLC reserves the right to change or use multiple shipping methods when deemed more efficient.

HRD MOD KIT PRICE: $42 + $6.50 S/H (US)*


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 2007-2017 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