Al,
I had exactly the same concern regarding variacs. I spent $1K having dedicated lines run to the room, and who knows how much on PCs. Now I'm supposed to run everything through a cheap variac? I'm also concerned about limiting current. Don't really want to throttle down the juice! On the other hand, one of the PS audio regenerators used might be a reasonable investment. I just know that not everyone likes these, especially for power amps. So even that is an expensive experimental question. I much prefer the do nothing option, but I won't be happy if I am buying new 300Bs 6 times a year.
With respect to my nice words, my parents raised me right. Sometimes the children need to remain silent while the adults converse. Its been too long since my college physics course. Electrons are important to organic chemists too, but we are interested in pushing them from one nucleus to another, not pushing them through a bunch of wires and circuits.
