gb wrote:
wrote in message
...
Thanks to Phil Nelson and many others for great internet
documentation and numerous usenet posts regarding the SX-28. I
followed Phils RF deck instructions and re-capped my radio, which is
currently still on the bench. I also have a sx-28 parts radio which
has been invaluable for various mechanical repairs.
[snip]
Any old articles on product detector mods for the SX-28 would
be great to read to assist in un-modding this thing!

Thanks!
Ben

Ben -

Bill Orr' Radio Handbooks use to have an artcile and schematic for using a
6SN7 as a product detector in 1950s and 1960s vintage receivers (that use
simple diode detectors).

The later Radio Handbooks had the same detector, but they used a 12AU7
instead of the 6SN7.

Don't assume that the person doing the modification did not know what
he was doing. Adding a product detector is generally a great improvement
for a radio that is used for CW or SSB reception.

What I would do, is trace out a schematic for the area around the 6SN7,
and see what was done. It might be a great improvement to a mediocre
(by todays standards) receiver.

-Chuck