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

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

Edward Knobloch wrote:

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

Maybe it was an April Fool's article. Anything similar published
nowadays might be considered so given the going price for an unbothered
SX-28.

-Bill

".Bill" wrote in message
...
Edward Knobloch wrote:

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

Maybe it was an April Fool's article. Anything similar published
nowadays might be considered so given the going price for an unbothered
SX-28.

-Bill

It wasn't an SX-28; it was a basket case S-40A Ed. E. ressurected for his
grand kids.

Pete