There was an article in QST many years ago ( late 1960's ??) which was
one of the early direct conversion articles. This one used 88 mH filters,
and a three transistor audio amplifier. It was written by Doug Demaw, if
memory serves, and it is probably the simplest, but useful, direct
conversion design I have ever seen.

Granted, getting 88 mH coils is not as easy as it was back then, but all
in all, I think this fits the original request. The radio used NPN
transistors thoughout.



Jim
N6BIU