I received the following question from a visitor to my website. Anyone out
there have an answer? Some of you have stacks of old CQs, etc., much bigger
than mine. I usually frown on modifications to old gear, but this sounds
like it could be harmless fun.

Regards,

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

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I thought perhaps you might be familiar with an old article describing some
modifications (reversible, non-destructive) to the SX-28. It described a
series of improvements, one of which was an outboard additional i.f. stage
using a 6BA6. Another was a product detector using one and a half 12AU7s. I
think it appeared in an issue of CQ Magazine or similar publication,
probably from the Fifties or early Sixties.

By any chance do you know what magazine and issue/year it appeared in?

------------------

"Phil Nelson" wrote in message
link.net...
I received the following question from a visitor to my website. Anyone out
there have an answer? Some of you have stacks of old CQs, etc., much
bigger
than mine. I usually frown on modifications to old gear, but this sounds
like it could be harmless fun.

Regards,

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html


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.

Pete

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