What is a hot SS chassis?

[zeno]

Originally Posted by Rod Beauvex

I had always though a switching PSU was considered hot. Now I know different.

I vaguely understand how tube hot chassis works. I just thought that sort of thing didn't apply to SS.

On a switcher the primary side is hot, thats where most the PS
parts are. Regulation comes by sampling the cold side through
an isolator or sampling a separate winding. It can get confusing
what you have. There was even a Panasonic that had 3 grounds.
Others prob did it too. Over the years all the power supply variety
kept you on your toes & kept things "interesting".

For servicing best to use isolation always. I will admit for 35 yrs+
I never did unless plug-in test equipt was used. Only got one
really bad shock, lots of CRT's discharges "SNAP !" , tingles & a few ZZZT's. But play it safe..........
Last thing is when you get to SS sets know what you got & which
ground to use while troubleshoosting.

73 Zeno