[Pete[_2_]]

12AX7 is a miniature dual triode vacuum tube with high voltage gain. It is
believed to have been originally developed in 1946 by RCA engineers in
Harrison, New Jersey under developmental number A-4522. Release date for
public sale under the 12AX7 identifier was September 15, 1947. 12AX7 was
originally intended as a miniature form-factor follow-on to the 6SL7 family
of dual-triode amplifier tubes for audio applications. Its ongoing wide use
in guitar amplifiers (see Valve sound) has caused it to be one of the very
few small-signal vacuum tubes to continue in production since it was
introduced.


wrote in message
...
In rec.antiques.radio+phono Pete wrote:
?????Why is that.......The Marantz 7 (1959) had 12AX7's and it's a
stereo
design....These are mono amps with the phono equaliztion
feature........Can
you specify a date that the 12AX7 went into production? While you are
doing
that I'll check the web for C-8 info....

I was referring to your remark about the late fourties. The 12AX7 (ECC83)
would be a mid-fifties type as far as I know.

--
Met vriendelijke groet,

Maarten Bakker.