[R-390] R-390] I got my R-390 working!!‏

[John Burke]

Jim,
When I restored my 1954 Motorola R-390/URR I found a majority of the 2.2k ohm 1/2 watt 
resistors in both the RF and IF deck to be well out of tolerance. I also had to replace several 
other resistors for the same reason. The performance improved dramatically and several of the
original problems were cured at the same time. Since I have been unable to locate a copy of
the parts manual for the 390, I have been unable to ID the resistor manufacture but they are 
smaller then IRC or AB 1/2 watters and have a rough texture to their surface. Also, the resistors
in the power supply regulator are most generally out of tolerance due to the heat problem in
this design, so take a look at them too. It's well worth the effort.  
73, John - W0ENE