[GreenKeys] ARRL Handbook TU Limiter Circuit wanted

[Ethan Blanton]

Alf Fisher wrote:
> Please can someone find me a scan of the the input Limiter circuit used in a
> TU in an ARRL handbook - probably around 1955 to1960.
>
> It uses a double triode (6SN7 or 12AU7) with its cathodes connected together
> and the output is taken via a transformer.

I couldn't find it, but I can confirm that by 1965 it was not the
circuit you are looking for.  1965 is a W2PAT design which uses a 6SN7
with both cathodes grounded, but the output is  taken off the plate of
the second section at pin 5.

Ethan