[R-390] Oscillation Spurs
Patrick Nelson
aaptmf at onepost.net
Wed May 5 21:00:22 EDT 2010
Hello Roger and Barry,
Adding another resistor to parallel the old resistor would be about the same amount of work as replacing the bad resistor in this case.
I wasn't entirely accurate about the resistor being under the band switch. It is under the crystal oscillator drive shaft and I don't know
how to remove it. As I recall, it required removal of some roll pins.
I sort of have access to pin 7 of the tube socket, but because of the drive shaft my soldering iron is barely able to touch the very tip of
the socket lead. The other side of the resistor is a different story. It is burried under several other components but ultimately connects
to a cathode bias circuit for the two RF amplifier stages. I could either remove the other components, or run a new wire over to the rest
of the bias circuit. Anyway, still am thinking about how I'm going to do it.
In the mean time, I decided to write up a restoration article on my R-390 (still a work in progress). If you are interested it is here:
http://www.sunday-special.net/r390.htm
Thanks,
-Patrick
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