Uncle Peter wrote:
"Phil Nelson" wrote in message
link.net...

We ran a modification for the S-40 receiver that used a dual triode
which worked as both a product detector and AM detector. I
suppose it could be added as a plugin device on one of the tube
sockets. The article was by Ed Engelken and ran in Popular
Communications a few years back.

Myself, I am going to use the Central Electronics SideBand adapter
on my S-28.

I saw an article about a vacuum tube product detector circuit
which used no B+, the article appeared in Pop. Communications in 1998 or
so. I thought it might be an April fool article. Sorry, I didn't
save it for future reference.

73,
Ed Knobloch