Chuck Harris wrote:

I have checked all of my RCA handbooks, and they
only list the 6SN7GT.

Same in the GE Tube manuals. I too would have sworn there had
been a metal version, but it must be my Alzheimers! :-)
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Irv Finkleman,
Grampa/Ex-Navy/Old Fart/Ham Radio VE6BP
Calgary, Alberta, Canada