[R-390] Need Dial Lock mechanism & knob

[Jacques Fortin]

Hi Doug,

Sorry, but I do not have any dial lock mechanism left.
For your question 2, the 3TF7 (2HTF11B) ballast tubes are becoming quite
rare these days...
What I use as a trick is to jump pin 2 to pin 4 and pin 7 to pin 5 of the
RT510 socket.
Then you can plug in either a 12BY7 or a 12BH7 tube to replace the 3TF7.
The tube does not need to test good, as far as the filament still have
continuity.
Works fine in two of my R-390As.
Cannot see a difference with the third one that still uses a real 3TF7.

For the question 3, as far as the plug holds OK, you don't need it.

I also hope that your Hickock 600A still works correctly !

73, Jacques, VE2JFE