[R-390] 390 non-a rectifier

[Dan Merz]

Hi, I'm getting a 390 non-a back to life and am dealing with putting the
missing rectifier tubes back and the missing ballast tube. I've refreshed my
awareness of many of the past posts on replacing the 26z5 rectifiers with
solid state,  12bw4's etc and the schemes for the ballast tube
substitutions.  I've decided to put a 12BH7 in for the ballast tube and
tentatively grabbed the idea of putting 12bw4's in place of the 26z5,  with
a little rewiring required on the tube sockets.  However,  after looking at
the 390 circuitry a little more,  I realized that maybe with the 390 just
putting in solid state rectifiers may be the best thing to do since the
regulated  B+ circuitry with the 8082 tubes/VR tube may take care of the
extra voltage and immediate voltage application that seemed to be one of the
disadvantages of using solid state rectifiers with the 390a.  The 10 uf
filter capacitor would still see the immediate voltage from the rectifiers
but the rest of the radio past the 8082's would not.  Am I right in thinking
this way or is there still a requirement to put a 200 to 250 ohm resistor in
to mediate the voltage with the 390?  I didn't seem to find much about ss
rectifiers being used specifically for the 390.

I'm looking for one original knob to go on the antenna trimmer - a well worn
one would be ok since the rest are in that condition. I think this knob is
the larger type of two similar knobs??  Dan.