"Geoffrey S. Mendelson" wrote:

I'm joing this late, but here's some more practical suggestions:

1. Buy a REAL surge protector such as a Trip Lite ISOBAR. Around $100.
There are clones made by someone else for Hi-Fi's for about $250,
IMHO not any different except in marketing.

Surges are very unlikely to be the problem.

More likely is long term modest overvoltage.

Graham