On Sat, 24 Mar 2007 19:29:51 +0000, joseph2k wrote:
Michael A. Terrell wrote:
joseph2k wrote:

And just what tubes were those? Of the about about 1000 failed tubes
that i have seen well over 95% were just filament / heater failures; and
not one broken envelope except for two mechanical shock victims.

I've seen horizontal output tubes where the glass melted when the
drive failed. It also destroyed the flyback transformer. A few of the
melted tubes had a hole in the glass, while others just softened and
shrank till they were touching the plates. Maybe a half dozen melted
tubes in 30 years.

Hmmmph. Failed protective circuits or hardware. Fuses should have blown
and circuit breakers tripped before that that happened. They weren't a
Muntz brand were they?

Actually, fuses and circuit breakers aren't intended primarily to protect
the equipment itself - they're to keep the overcurrent from burning down
the house (or factory, or whatever).

Cheers!
Rich