In article
,
boardjunkie wrote:

On Feb 7, 6:16*am, (George Cornelius)
wrote:
I have a tube from the ENIAC.

A 12AX7?


More likely a 12AV7 or maybe a 12AZ7.

None of the above; baseless miniature tubes like those didn't show up
until quite a while after the ENIAC was developed.

Most likely it would be a 6SN7, though other octal-based tubes of
similar vintage were used too.

Isaac