Guitar Player (April 1980)
How do you modify your amps?
EVH: Okay, I use a combination of two different kinds of amps. They’re both Marshalls, but one kind actually has less power than the other, which is boosted. I use them together(slaving

). The ones that have less power have a giant capacitor in conjunction with the fuse; if anything happens, the fuse blows first. The capacitor has something to do with the computerized ignition system of a car. I can’t give you the exact specs, but it looks like a stick of dynamite, only fatter. What it does is suck juice. I hook it up to the fuse holder and the mains, and it lowers the voltage about ten volts so the amp lasts a little bit longer. It doesn’t really change the sound, but whatever I use, I use to the max. I just turn it all the way up. So this capacitor lowers the voltage and the amp lasts a little longer. I still have to retube them once a week. (Editor’s Note: This is not a recommended procedure for modifying amps and should not be attempted by anyone inexperienced in the field of electronics and amp modification.)
GP: What is done to the other kind of amps?
EVH: I use a Variac, which is like a dimmer on a lighting system. It’s an autotransformer which goes all the way from 0 to 160. In the studio I crank it up to 140 and watch the tubes melt! (Editor’s Note: Again, this is not a recommended procedure for modifying amps, as Paul Rivera of Rivera Research and Development points out: “You can cause severe damage to the amp besides melting tubes. Since a Variac is an exposed transformer, by hooking it up incorrectly you could get the hot of the AC line on the chassis of the amp and electrocute yourself. Anyone wishing to attempt this sort of modification should go to a knowledgeable repairman.”)
GP: Do you lose many amps during your shows?
EVH: Yeah, but I have so many of them. I have like 12 to 15 100-watt Marshalls onstage in pairs of four, hooked up together. Then I have three switches where if the first stack blows, I can switch in the next one. That’s about it for live. I have such a big setup: 80 12” speakers for my last setup, which was the equal of 20 Marshall cabinets. The next one will be World War III. But it’s not for over-blitzed noise.
GP: Is it to refine the sound?
EVH: It’s to make a good tone even louder. Some people get a sound like an amplified AM radio. I like it to be like a nice home stereo amplified -- you now, the difference between tone and no tone. I have some other tricky stuff in my amps which I don’t even want to talk about because if someone reads it in the magazine they are going to hit up Jose, an old guy from Argentina who knows a lot of tricks and does stuff for me. He doesn’t want people to know who he is because he’s getting mobbed. He also puts little things inside my MXR stuff, like permanent gain

controls that boost when I kick them on. I don’t even know what they’re called. They reduce noise and boost the signals.