Using autotransformers

When I referred to voltage irregularities I was talking about constant variances in the incoming voltage. Often as high as 130-135 Volts and on other occasions it would drop to below 110. Already I have spent big bucks on the repair of a Krell FPB 350 because the caps overheated and leaked all over the circuitry.

Just got back into town so will review the comments above and respond. Don't go away!

I have read (and re-read) all of your posts - Thank you! Yes, Al, you were right. I was considering an autotransformer as defined in Wikpedia. The idea was not mine but someone who works on all forms of electronics. Now I am wondering if looking for something that would control the entire house might not be a better choice. We currently have voltage regulators on most large appliances, including the APC battery back-up but nothing on the amps.

All of the options look expensive, OTOH, paying 1,000 to repair an amp is not cheap either.

I will look harder at the Variac and see if that makes sense.

Thanks to each of you for the input.

I do not live in the USA. I now live in Mexico.

The AVS looks interesting. I can contact them for more info but do you know, of hand, if the AVS would handle the load for 2 Krell Monos or would you have to buy an AVS for each amp?