"ken scharf" wrote in message If you
want to use tubes from the same era, then I'd pick a '27 for the
oscillator. The 27 is probably the first tube in a chain of evolution
that led up to the 1626 which was used for the same purpose in the ARC-5
transmitters. (though the 1625 is a heck of a lot easier to drive than a
'45!).


I agree Ken. A lot of the early 30s rigs used a tetrode driving a 45.
I'll have to dig deeper. (Looking for retirement projects!)
I saw a neat design using a pair of 30s to drive a P-P pair of 33s in
one battery TX QST ran in 32 or so.

Pete