Powering up with a variac

[texwest]

I have a variac and would like to know the correct procedure for slowly powering up a tube amp in order to form/reform electrolytic caps. I was told you need to use a solid state rectifier plug on amps with rectifier tubes. Is this true?

Would very much appreciate a detailed procedure to do it correctly.

Thanks

Wes

[Enzo]

Or tack a couple diodes across the rectifier socket with clip wires. The point of forming caps is to apply a low DC voltage and steadily increase it until you get up to the full voltage. A tube rectifier won't work well with the mains on 20 volts. SO yes, put in a solid state rectifier for the process.

Now a question. How many times in your experience have you fired up an amp without forming the caps? How many times did they blow up?

[Twist]

I agree with Enzo. I've replaced hundreds of electrolytics and never had any problems. I'm sure there are valid arguments for forming caps. I decided a long time ago it's just splitting hairs. I always use a variac when firing up any repair just to make sure there are no shorts. Mine has an AC current meter.

[Enzo]

I consider the current meter to be an essential part of the thing. If it doesn't have one, arrange to connect your DMM set for current in series with the load.