Mike Knudsen ) writes:
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 driveer. --Mike
K.

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

Wasn't an old trick to put a relay in the line to the BFO? So when
you turn on the BFO with the existing switch, the current through
the relay causes it to switch, and then the relay contacts can
route the audio properly.

Michael