[R-390] R-392 help

[Mark Huss]

This is a little off subject, but I just procured an R-392/URR from a 
little old lady in Pasadena (O.K., she is not that old, and she is from 
Tucson). Designed by Collins between the R-390 and R-390A, it has much 
more in common with the R-390 than the A. The major differences are a 
different tube set, a fixed squelch level (you adjust it using the RF 
Gain control), and the lack of the 16 kc, 1 kc, and 0.1 kc bandwidths. 
It also is powered by 28VDC without using a dynamotor or vibrator power 
supply. This means that the B+ voltage is 28 VDC!

It came advertised as working, but did not when I first hooked it up. 
But after plenty of knob-twisting (I Looooove twisting knobs), the 
switches cleaned themselves enough to get working. With one caveat. When 
I switch to the CAL position, the thing cals up nice. Switching back, 
however, the receiver is almost dead for about fifteen minutes, then 
slowly regains its sensitivity. Note that I live near two strong AM 
stations that put better than 10 millivolts into the receiver. And there 
is no loss of sensitivity when tuning across them. Also note that 
switching to Standby, then back into Normal does not cause the problem 
(eliminating the antenna relay).

Have not started troubleshooting it yet. Anybody have any ideas? And are 
there any other R-392 owners out there to swap knowledge with?

By the way, she is horrified that it did not work when I got it, and is 
grateful that I am sooo… understanding about it. But it came with the 
power connector, all the tools and tube pullers still inside, origional 
audio output tube, and an original manual. And with the exception of 
more than a few scuffs on the case, remarkably clean! She 
just.doesn’t.get.it!

P.S. Anybody have an LS-166/U speaker with origional connector they are 
willing to part with?