I picked up a clean BC-946B radio a few weeks ago. Yesterday I set about restoring it, it was a lot bigger job than most. As is in many 80 year old Command sets someone in its life hacked around in it. One of the changes was the addition of a standard output transformer, which I retained. The front shroud was also removed so I had to extend wires into the front of the radio and construct a shield for the RF input to the RF amp grid. Then I cleaned up the prior modifier's crappy wiring.

I usually spot check resistors prior to conversion, in many cases they are off but still close to tolerance, in the case of this radio almost all the resistors required change. This also included the resistors in the RF cans. I also found the mica capacitor on the grid of the RF amplifier to be 10PF rather than 100PF. While I had the cover off I lubricated the bearings and worm gear. Once that was complete I rewired the filaments for 12 volts and used my Kitparts capacitor replacement kit to replace the capacitors. I also loosen and retighten the 8 screws holding the resistor terminal blocks, in the case of this radio it made a big improvement in the noise level. I am sure there has been a lot of expansion and contraction since those screws were last screwed in 80 years ago.

It is always encouraging when the radio comes up working! My bench test here in Houston is to tune in WWL in New Orleans, which is over 350 miles away.

Best Regards ... tom, N3LLL