[R-390] looking for parts

[john page]

     Yesterday I asked if anyone had an I.F chassis as mine had a bad 
socket. And since it was in a really hard place to get to I thought I would 
try to get a new unit. Thanks to all who responded with help and offers.
     I thought I would have one more crack at it before shelling out lots of 
green.
     GOOD news. I did fix it. Acted like a bad socket in that you could 
wiggle the tube and it would work. Yes I did try several other tubes.
     Today I got to measuring voltages at the socket. It was V501 the first 
I.F. amp. No B+ on pin 5 but it did have screen voltage on pin 6. 
Hhhhhmmmmmmm. It sure doesnt have far to go from pin 5 to pin 6. Well it 
turned out to be in a one inch piece of wire from L505 to V501 pin 5. It was 
broken inside of the insulation. I was able to repair the wire and now the 
unit works great. Well almost great.
     Now it wont turn off. The filaments stay on as does the dial lights. 
Looks like the micro switch on the function switch is staying closed. That 
sure looks like a pain to get to. Oh well I always wanted an instant on 390. 
Its always in standby this way.
     I remember someone saying that this is not good though.
              Learning the 390 the hard way,   John


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