Ed wrote:

I am looking for a nice schematic, and perhaps additional info, on a
12V (fil. & plate) tube superhet Rx; just something fairly simple
for CW/SSB reception without bells and whistles, and preferably for
75M/40M reception.

Can anyone point me to info on this? Thanks.


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That design was common in the car radios of the late '50s to early
'60s. They used tubes for all functions except the output amplifier,
which was a transistor. You can probably find old Sams manuals on ebay,
or just copy an existing HV schematic and substitute the 12v tubes.
There isn't a very great difference.

Incidentally, if you have trouble finding the tubes designed for 12v on
the plate, ordinary HV tubes worked fairly well but with somewhat lower
gain. My first job after high school was repairing those radios.

Also, the 12v tubes were quite prone to develop microphonic problems.
The design only lasted a few years until good transistors became
available cheap. They are an interesting bit of electronic history, but
not really practical today. A five cent transistor will outperform what
has become a very scarce and expensive 12v tube.

But have fun anyway. :-)

--
Bill, W6WRT