- Mar 16, 2010
- Reaction score
Sounds like a good solution - however I am not an amp tinkerer or builder, so it's easier for me to buy something I know works properly from the start - lol. I'm also thinking the Brown Box might be good for me because I have no need to get it down to 89 or whatever number, I just want to run my amps as they were intended. Friedman has said these are good too, but less "variable" than a Variac - however I don't need that functionality.If you don't want a CHARIAC (or is it "VARIACH" now?) you can find the original US VARIAC branded ones by General Radio company on eBay used for not much more. I've had those, as well. Usually, you'll want to clean them carefully and replace the hookup leads with modern heavy gauge, well insulated wire, and make sure the grounding system makes sense and is up to today's standards.
I do use a Chinese one, myself, but I've removed the core to put it in a larger steel rack chassis with some other power regulation and metering equipment, grounding it well.
If you use a Chinese one, just look around on YouTube to see how to fix the internal chassis grounding. There is high direct-connected mains voltage just millimeters away from the improperly grounded steel chassis, with moving parts inside that move when you put your hand on it. Not good.
The indicated output voltage being inaccurate on the dial and meter is no big deal. If you need an exact reading (because EVH said "89 volts" or something) just put a proper meter after it.