November 2018

Amp DIY

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.
Read More

Ask Amp Man: The Vibro Champ Voltage Mystery

February 13, 2014
Why do the schematics differ between two supposedly identical CBS-era Fender amps?
Read More

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.
Read More

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.
Read More

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.
Read More

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?
Read More

Ask Amp Man: 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.
Read More

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.
Read More

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.
Read More

Ask Amp Man: 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.
Read More

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.
Read More

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.
Read More

Ignore a Modern AC30’s Standby Switch?

May 11, 2013
This amp has a history of eating power tubes and rectifier tubes.
Read More

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?
Read More

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
Read More

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?
Read More

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.
Read More

Beefing Up Channel 2 in Fender's The Twin

November 5, 2012
Found in backlines around the globe: Fender’s burly 100-watt, red-knob The Twin 2x12 combo. Photo courtesy of ampwares.com Hi Jeff, I have a couple of Fender The Twin amps:
Read More

Tightening Up A 1972 Fender Deluxe Reverb

October 8, 2012
This 22-watt Fender Deluxe Reverb is one of the world’s classic 1x12 combos. Hi Jeff, I have a 1972 Fender Deluxe Reverb. It sounds great, so I don’t want
Read More

More Carvin Belair Mods

September 5, 2012
Let’s dive into two more mods.
Read More