Theo wrote:
Regarding the "all metal" tubes series by RCA,
can anyone tell me if there was ever a metal version
of the 6SN7?
I cannot find any reference on the web.
Any help would be greatly appreciated.


The 6SN7, being a dual triode with all elements pinned out separately,
would need all 8 pins on the octal base. On metal tubes, pin #1 was
always reserved for a connection to ground the metal shell.

There aren't enough base pins available to make a metal 6SN7 possible.

Bob Weiss N2IXK