[R-390] Army/Navy/MARS/other "customer" breakdown for 390A's?

[Tim Shoppa]

We've got a good background on the various manufacturers/nameplates of
R-390A's. I'm not claiming it's perfect, but it certainly satisfies most
of my
curiosity about who built what and when.

What I do not necessarily know is a breakdown of the "users" of the
390A's. Obviously there's the "Navy diode load point on the front panel"
mod. I don't know if every Navy unit had this done or just certain ones.
My
guesstimate is that most of the radios sold by Fair over the last couple
years
came through the Navy chain based on this mod and pictures and
comments that I read. But of course this is heavily influenced by where
Fair got them from, right? So just because most of the Fair Radio
chassis
had the doide mod I would be wrong to say that most 390A's were
used by the Navy?

Was there any cross-pollination between Army and Navy depot repair?
i.e. Did Tobyhanna do Navy radios too?

I also know that certain 390A's went to hams in MARS, many of which have
passed away and their equipment redistributed. Did MARS ever want radios
back? Could radios be turned back in to MARS for depot maintenance and
you got a refurbed radio, or were the hams pretty much on their own
after
they got issued equipment?

Also I'm sure that certain units went to embassies/spy agencies/military
contractors etc. and might have been maintained outside the depot
system. But I'm guesstimating that these numbers are in the very very
low
percents.

And of course there were the EAC/Hammarlund "consumer" units offered
for sale in the late 60's... a hundred or so in total? In any event
these
had unique nameplates and serial number run, right?

So, finally:
Is it safe to say that if wasn't a Navy radio, and it wasn't a MARS
radio, and
it wasn't an embassy/spy agency/contractor radio, and it wasn't a
consumer
unit, that it was probably a Army unit? Or is there a category of user
that
I'm missing out on?

Sorry if these are all silly questions. What little I know about
military repair
depots I've guessed or read here. And while I've seen the ex-MARS
units 30 years after the fact, I don't understand the MARS organization
as it was in the 60's.

Tim.