t.hoehler wrote:
I'm sure the shield pin on the metal tube is for the metal enclosure

itself. I

think those were put on all metal tubes so that if an element shorted to

the

metal enclosure, it wouldn't wind up killing someone who touched the

enclosure.

Phil


I remember opening up a bad 6F6 metal tube a long time ago, and IIRC, there
was a thin glass envelope inside the metal can. Strange consruction, but
that is the way that one was made. I'm not sure any electrode could ever
contact the outer metal can, but maybe they are all not made that way. The
outer can was connected to a ground point as you referred to as the shield
pin.

I never took apart a 6F6, but the couple small-signal tubes I did take
apart did *not* have an inner glass envelope.

Don't want to sacrifice a metal tube to science? Here's a dissection
story, with photos:
http://www.r-type.org/static/6j5.htm

Cheers,
Fred
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