[Milsurplus] Russian US-9 receiver - follow-up

[wf2u at ws19ops.com]

Hello Groups,

I'm happy to report that after finding and fixing the wiring error in  
the dynamotor, the US-9 receiver is healthy and functioning well; it  
was already used on the air during the US East Coast Old Military  
Radio Net last night (80 M CW).

Judging by the performance (by ear) it doesn't need any tune-up at this time.

While working on it, the interesting observation is that all the tubes  
had 1979 manufacturing dates, with the date of retubing the receiver  
handwritten with silver ink on each tube: June 1982. (My US-9 was  
manufactured in 1962). The tubes are the Russian versions of the  
standard metal-octal tubes used in the BC-348R, with the exception of  
the local oscillator tube which is a triode-connected equivalent of  
the 6SJ7 tube (the BC-348R uses the 6C5 triode). Also, the US-9 uses a  
standard voltage regulator (octal) tube unlike the BC-348 which uses a  
small bulb-like regulator.

Another fact is that the standard BC-348 shock mount and power plug  
fit the US-9 with no problems, so I dedicated one of my BC-348 mounts  
to co-exist with the Russian receiver.

Wishing all a Happy New Year.

73, Meir WF2U
Landrum, SC, USA