Actually a Variac just changes the input voltage....the amp will still be loud and the tubes will get pretty damn hot. By lowering the voltage you could be helping the life of the tubes, but I'd say that is actually debatable. The only thing you'll really notice is a change in tone over a certain voltage range....it sure as hell won't change the volume enough for you to notice.
A powersoak type device doesn't change the voltage of the amp. All it does is attenuate the power going into the speaker cabinet, so you can play with your amp cranked at lower volumes. Don't confuse the use of a Variac with the use of a powersoak, as they are for two different things.
From what I've gathered, Ed's early rig used the Variac to lower or raise the input voltage from 80-140 volts, and he used a homemade dummy load resistor to fool the Marshall into thinking there was a speaker there. A signal was then taken from that dummy load and run into a couple of effects and a rack EQ. From there it went to a power amp and then into two cabinets...one with 25 watt Celestions and the other with JBL speakers. The power amp was cranked to distort the speakers. Note that this is a tad bit different from the setup of his later rigs...especially those used with Van Hagar, in which he had a wet/dry/wet type of speaker setup.
A powersoak type device doesn't change the voltage of the amp. All it does is attenuate the power going into the speaker cabinet, so you can play with your amp cranked at lower volumes. Don't confuse the use of a Variac with the use of a powersoak, as they are for two different things.
From what I've gathered, Ed's early rig used the Variac to lower or raise the input voltage from 80-140 volts, and he used a homemade dummy load resistor to fool the Marshall into thinking there was a speaker there. A signal was then taken from that dummy load and run into a couple of effects and a rack EQ. From there it went to a power amp and then into two cabinets...one with 25 watt Celestions and the other with JBL speakers. The power amp was cranked to distort the speakers. Note that this is a tad bit different from the setup of his later rigs...especially those used with Van Hagar, in which he had a wet/dry/wet type of speaker setup.
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