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Ask Amp Man

Ask Amp Man: Expanding the Tone-Shaping Power of a 20-Watt Marshall Clone

December 7, 2014
Can you add separate bass and treble controls to a Marshall-style amp channel with a single tone pot?
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Ask Amp Man: Dean Markley Signature Series Amps

October 22, 2014
Clapton, Lifeson, and Summers used them, but 30 years later, these innovative amps are largely forgotten.
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Ask Amp Man: Restoring a Deluxe Reverb’s Magic

September 29, 2014
Can a different rectifier tube improve an amp’s sound and feel?
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Ask Amp Man: Modifying an Early Fender Super-Sonic 60

August 26, 2014
Learn how to update a first-generation Super-Sonic 60 to current model specs.
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Ask Amp Man: Can My Fender Amp Sound More Like a Marshall?

July 31, 2014
Modding a ’80s Fender Concert for JTM-style tones.
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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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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: From Silverfaces to Silvertones

March 24, 2014
Making sense of the external speaker jacks on vintage Fenders—and resurrecting a cool old Silvertone.
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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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Ask Amp Man: Pumping Up an ’80s Fender Champ

September 20, 2013
These simple mods can nudge a Fender Champ toward a more Marshall-like sound, with increased mids, greater headroom, and improved overdrive tones.
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Ask Amp Man: Upgrades for Silvertone and Fender Hot Rod Amps

August 13, 2013
This month we look at changing the gain structure on a Silvertone and dealing with volume fluctuations in a Fender Hot Rod Deluxe.
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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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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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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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