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Amp DIY

Ask Amp Man: Does My Mesa Head Need All Eight Power Tubes?

July 9, 2014
Can you remove half the power tubes in a Mesa Simul-Class head to play at lower volume?
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The Mean 18: British-Style 18-Watt Amp Kits from Mojotone and Tube Depot

July 1, 2014
We built two killer Marshall 18-watt amp clones from kits. Which sounds best? Which was more fun to make?
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Ask Amp Man: A Fender Head Transplant

May 26, 2014
A home-surgery survivor—and the relative merits of KT66 and 6L6 tubes.
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Ask Amp Man: Removing Output Tubes to Reduce Power

April 21, 2014
Want to reduce the power in an amp with four output tubes? Here’s how to do it right.
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Ask Amp Man: The Vibro Champ Voltage Mystery

February 13, 2014
Why do the schematics differ between two supposedly identical CBS-era Fender amps?
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Ask Amp Man: Better Tones from “Boomy” Tweed Deluxes

January 9, 2014
Fender’s classic 5E3 circuit is prone to “flubbiness” at high volumes. Here are several easy fixes.
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Ask Amp Man: Better Biasing for Silverface Twin Reverbs

December 9, 2013
Blackface-style biasing makes it easier to set up and service ’70s Twin Reverbs.
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Ask Amp Man: Twintervention (aka Rescuing Rotten Twin Reverbs)

November 13, 2013
Master-volume Twin Reverbs of the ’70s have a deservedly bad reputation—but a few circuit tweaks can save them.
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Ask Amp Man: The Early-’70s Silverface Fender Twin Reverb: Dud or Dynamo?

October 15, 2013
Why don’t master-volume Twin Reverbs get any respect?
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Identifying Vintage Fender Speakers — and Battling Hum

July 29, 2013
What kind of speaker is in a 1965 Deluxe Reverb, and how to switch it out without increasing the amp's volume, plus tackling hum in modern Fender combos.
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DIY: How to Replace Your Amp Speakers—The Right Way

July 19, 2013
Whether you’ve blown your existing cones or are one of the adventurous few who realizes how powerfully you can tweak your tone with a new speaker, this 17-step guide shows you how to deal with everything from impedance to phasing and series/parallel wiring.
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How to Install Speakers in a 4x12 Cab: 2-Part Video Tutorial

July 19, 2013
In this two-part tutorial, Nashville amp tech Skip Sims shows you how to replace speakers in a 4x12 guitar amp cabinet.
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Playing it Cool with a Hot Rod Deluxe

July 16, 2013
Jeff addresses reverb dropouts and volume drops or fluctuations potentially caused by failure of a Fender Hot Rod Deluxe's low-voltage power supply.
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How Tube Amps Work

July 15, 2013
From voltage conversion to capacitors, pentodes, and class A operation, we demystify the basics of tube-amp functionality.
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Attenuating a Fender Hot Rod DeVille

June 13, 2013
A band that doesn't mic their amps looks to pump the low end out into the room using a THD Hot Plate setup.
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Ignore a Modern AC30’s Standby Switch?

May 11, 2013
This amp has a history of eating power tubes and rectifier tubes.
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Bringing a Supro 1x10 Out of the Closet

April 15, 2013
Because of the amp’s age, should I remove all the caps and put them on a tester before attempting to power it up?
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Adding an Extension Cab to a Fender Combo

February 4, 2013
Fender’s reissue ’65 Princeton Reverb includes a 10” Jensen C-10R, a long-spring reverb tank, a pair of 6V6 power tubes, and a 5AR4 rectifier tube. Photo courtesy of Fender
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Hot-Rodding A Fender Champ 12

January 9, 2013
I primarily use it as a practice amp at home, typically at lower volumes, and I’d love to get tones similar to a Fender Tonemaster. Is that possible?
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Tweaking a Fender Super 60

December 10, 2012
I have a Fender Super 60 head without tubes and was wondering if there’s any way to modify it to get a JTM45 sound.
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