Isolation transformer - does it offer protection

.

your link doesn't work.. too many http://

http://en.wikipedia.org/wiki/Surge_protector

Perhaps the SA wasn't harmed...

Many surge protectors have components that absorb the spike but by design they get fried in the process. It is possible that your unit protected your stereo but can't do it again.

,

Herman, I just clicked on it and got right to the surge section.

In an isolation transformer the output winding will be isolated, or floating from earth ground unless bonded at the time of installation. Secondary neutral to ground bonding virtually eliminates common mode noise, providing an isolated neutral-ground reference for sensitive equipment and an inexpensive alternative to the installation of dedicated circuits.

An isolation transformer allows an AC signal or power to be taken from one device and fed into another without electrically connecting the two circuits. Isolation transformers block transmission of DC signals from one circuit to the other, but allow AC signals to pass. They also block interference caused by ground loops. Isolation transformers with electrostatic shields are used for power supplies for sensitive equipment.