I would just add that when experimenting, make sure the amp is in a generally good state of repair first. Some of the previous answers address that pretty well. It made my amp sound less harsh and cut some of the exessive high frequencies I was hearing. Lowering the voltage to 110V seemed to definitely improve my tone. Its a 'Tenma' brand variac that I dont think they technically make anymore, but it seems to be very high quality for the price.
Historically, that scenario doesn’t enjoy any substantiation.Ī better question would be “What considerations should I be aware of when running my amp with a variac turned down to some point below optimal voltage?” Below is a picture of the variac that I purchased. If you assume Sylvania 6CA7s were always used (likely since available E元4s at the time were generally poor), that rumor seems suspect since those were very rugged tubes and you’d have to bias them to the point where they sound terrible for that to be the case, and more likely blow output transformers frequently. Rumors that power tubes on amps used live were biased way hot, necessitating frequent changes, don’t line up with how amps were recorded on albums. How a 100W amp works with 2 vs 4 tubes installed is night and day, even without considering the variac aspect.ģ) How the tubes are biased was critical to the sound. One claim was that during the recording of I, 2 power tubes were pulled. You have to operate under the following assumptions:ĮVH was always cagey and inaccurate about what he was doing and assigning secret mojo to a tech that didn’t do most of what he claimed.Ģ) Most other claimed operating circumstances are true.
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