Hi Mike,
That mod should apply to all of the 51J series receivers. I know
for sure that it is on the J3 and J4, and on the R-388 version of the J3.

Pete

"Mike Knudsen" wrote in message
...
In article ,
"Pete
KE9OA" writes:

No, it did not have a product detector. I did do one author's mod to
these
receivers over the years, where you convert the cathode follower for the
I.F. output to a product detector. It was great, because the mode switch
on
the front panel has an extra set of contacts that you can use for routing
the audio.

Would that mod also apply to the J3/R388? The need for extra audio
switching
is a big problem in most PD mods, leading to use of relays in R390A for
example, with all kinds of problems. Don't recall seeing extra switch
contacts
on my 388, maybe just on the J4.

Since the BFO switch is broken on my SP-600, I just might replace it with
a
3PST switch (good luck) and put a PD tube in place of the BFO
riveer. --Mike
K.

Oscar loves trash, but hates Spam! Delete him to reply to me.

In article , "Pete
KE9OA" writes:

That mod should apply to all of the 51J series receivers. I know
for sure that it is on the J3 and J4, and on the R-388 version of the J3.

Thanks Pete, I'll look for the mod -- any pointers?
73, Mike K.

Oscar loves trash, but hates Spam! Delete him to reply to me.

I lost the documentation years ago. The next best thing is the SSB detector
for boatanchors that I have up on my website. It is based on an NE602.

Pete

"Mike Knudsen" wrote in message
...
In article ,
"Pete
KE9OA" writes:

That mod should apply to all of the 51J series receivers. I
know
for sure that it is on the J3 and J4, and on the R-388 version of the J3.

Thanks Pete, I'll look for the mod -- any pointers?
73, Mike K.

Oscar loves trash, but hates Spam! Delete him to reply to me.

I only caught the end of this thread. Is someone looking for the Paul
Lee product detector mod? I know for certain I've seen it online
before, and may or may not still have the orig QST article somewhere.
There was also a sort of general summary of the similar mod for 4 or 5
different rcvrs published around the same time, which I might find if
I have a year to lookg. My 388 had this mod when I got it, seems
pretty good or so-so depending on what your present standards are. I
have to dub carefully with the BFO knob to dial in SSB but once set, I
can copy across the band, or even leave it at the same setting for
months. Tuning is a little touchy. But the rcvr also hasn't had a
maintenance-oriented finger in it for at least 20 years, either, not
even aligned, and is only connected to the ether with 10 ft of
dangling wire.

"Pete KE9OA" wrote in message ...
I lost the documentation years ago. The next best thing is the SSB detector
for boatanchors that I have up on my website. It is based on an NE602.

Pete

"Mike Knudsen" wrote in message
...
In article ,
"Pete
KE9OA" writes:

That mod should apply to all of the 51J series receivers. I
know
for sure that it is on the J3 and J4, and on the R-388 version of the J3.

Thanks Pete, I'll look for the mod -- any pointers?
73, Mike K.

Oscar loves trash, but hates Spam! Delete him to reply to me.

Those receivers had a nice sound with the mod...............I think it was
the wider I.F. that gave it that "hi-fi" sound, along with the smooth
sounding AGC.

Pete

wrote in message
om...
I only caught the end of this thread. Is someone looking for the Paul
Lee product detector mod? I know for certain I've seen it online
before, and may or may not still have the orig QST article somewhere.
There was also a sort of general summary of the similar mod for 4 or 5
different rcvrs published around the same time, which I might find if
I have a year to lookg. My 388 had this mod when I got it, seems
pretty good or so-so depending on what your present standards are. I
have to dub carefully with the BFO knob to dial in SSB but once set, I
can copy across the band, or even leave it at the same setting for
months. Tuning is a little touchy. But the rcvr also hasn't had a
maintenance-oriented finger in it for at least 20 years, either, not
even aligned, and is only connected to the ether with 10 ft of
dangling wire.

"Pete KE9OA" wrote in message
...
I lost the documentation years ago. The next best thing is the SSB
detector
for boatanchors that I have up on my website. It is based on an NE602.

Pete

"Mike Knudsen" wrote in message
...
In article
,
"Pete
KE9OA" writes:

That mod should apply to all of the 51J series receivers.
I
know
for sure that it is on the J3 and J4, and on the R-388 version of the
J3.

Thanks Pete, I'll look for the mod -- any pointers?
73, Mike K.

Oscar loves trash, but hates Spam! Delete him to reply to me.