Pete KE9OA wrote:

snip
Everybody seems to go for the 51S-1, not realizing that
the 51Js were a much better mechanical and electrical design.
A good testimony to this fact is that in the service center at
Rockwell-Collins in Cedar Rapids, they kept an old 51J-3 on hand as one of
their lab units.
snip

I also have a 51J-3 which is serving as a reference or lab receiver
(the back-end for other instruments, sensitive detector,
antenna testing, etc.) and as a benchmark receiver for comparisons
when testing other rigs.

BTW, what is your opinion regarding adding mechanical filters,
product detector, etc. mods to this rig (I have never found the
need but then again I don't use it for contesting)?

Regards,

Michael