[R-390] What have I got here???

[Vic/Johanna Culver]

Just brought home (Saturday last) an R-390/URR given to me by an old friend.
The label says it is by Collins Radio Co. and the Serial Number is 103.  The
ID plate has an order number (14214-PH-51-93).  A friend has had the radio
for many years and the radio seems to be in very good condition -- all
controls have very positive action, no slop, and the tuning controls are
smooth and without any indication of problems.  The front panel is in pretty
good condition with all of the engraving intact, meters, and etc.  My friend
is quite unavailable and so I can't talk with him about it right now, but I
will try to get in touch (he has moved out of town to a resident care
facility) and see what further information I can get.  I have an immediate
set-back in my plan to get it 'lit up' -- the power plug (J104) is a four
pin, keyed, plug with a place to lock it down (?) with some kind of screw
arrangement in the center.  I've not seen any connector like this.  Is there
any way of getting one (I'd like to avoid surgery if possible)?  There is an
adapter on the antenna connector (which is a two pin connector of some type,
again unknown to me) and it is labeled "Balanced 125 Ohm."  There is a
second connector looking much like a large BNC connector which is labeled
"unbalanced whip."  Are these standard impedances for R-390 antennae?
OH,yeah -- the back panel has three fuse holders at the bottom left with a
square metal attachment for storing extra fuses on the opposite side of the
rear bottom panel.  I don't have any docs for the R-390 but I do have for
the R-390A -- how far off will I be looking through those for information
about my radio?  I guess that's quite enough for now.  Many thanks for any
replies anyone is willing to make -- either on-list or off-list as seems
appropriate.  Vic  W4VIC


/s/ Vic Culver

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