[R-390] R-390A questions

[DW Holtman]

Hello,

I finally picked up two R-390A's Used/Repairables from Fair Radio. They are a little bit rough, but I think very restorable. My first question is with the front ID plates removed from the front, how can I determine the make and year they were made? I know most if not all of the modules are not original. They both have Cosmos PTO's. One has one fuse in the rear panel the other one has 3 fuses (newer?) in the rear panel.

Second question,  CR102, mounted on the inside rear panel is a Selenium Rectifier. Doesn't it have to be changed? Every other radio, that I worked on, one of the first things that I did was change out the Selenium and add a resistor for the additional voltage drop of a Silicon diode.

I have already gone through the Audio and If modules. It receives from 14 to 32 MHZ, nothing below 14. But, the good news is it does receive. Before doing any additional troubleshooting, next I'm going to remove the RF front end, clean all connections, check tubes and clean the gear, shafts and make sure all mechanical alignments are correct.

Thank you in advance for all of your help.

73's
DW Holtman