Using Osciloscope on Hot Chassis

[Electronic M]

Just don't connect both the test equipment and the radio to the isolation transformer at the same time....It is just as bad (for the electronics) that way as no transformer at all.

I just have separate a variac and isolation transformer and daisy chain them when I need both functions....I've considered building them into a common box, but decided I need isolation rarely enough to not want to always lug both around.