Effective August 1, 2026 International First Class Mail has been discontinued, as a shipping option, due to the inability to insure shipments with the United States Postal Service. Dismiss

Granger Amplification
  • Shop
    • Amplifiers
    • Amp Parts
    • Modification Kits
    • Apparel
    • Used Gear
    • Tools & Test
    • New & Featured Items
  • About
    • Warranty, Shipping, Repair, and General Policies
    • Privacy Policy
  • Contact
  • Bias Calculator
  • Account
  • Home
Select Page
Home / Modification Kits

Showing 13–24 of 27 results

  • Jose Master Volume Kit

    Jose Master Volume Kit

    $25.00
  • OptoFET Channel Switch Jack

    OptoFET Daughter Board

    $22.00
  • 1 Relay Switching Board

    1 Relay Switching Board

    $30.00
  • VariWattage Kit

    VariWattage Kit

    $80.00
  • Mesa 50/50 Power Amp Modification Kit

    Mesa 50/50 Power Amp Modification Kit

    $60.00
  • Bugera 1990 Regulator Kit

    Bugera 1990 Regulator Kit

    $6.95
  • Speaker-tapped Line Out Kit

    Speaker-tapped Line Out Kit

    $16.00
  • DC Filament Regulated Power Supply

    DC Filament Regulated Power Supply

    $35.00
  • Ultimate FX Loop Plates

    Ultimate FX Loop Faceplate

    $4.95
  • Passive Effects Loop Kit

    Passive Effects Loop Kit

    $7.95
  • LED Board Kit

    LED Board Kit

    $7.95
  • Mesa 50/50 Power Amp Modification Kit

    Mesa 50/50 Power Amp Modification – Instructions and Parts List

    $7.50
  • ←
  • 1
  • 2
  • 3
  • →
  • Shop
  • About
  • Contact
  • Bias Calculator
  • Account
  • Home
  • Facebook
  • X
  • Instagram
  • RSS
©2022 Granger Amplification LLC. All rights reserved.

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.