[R-390] R-390 "non A" cap replacement list/order?

[Jacques Fortin]

Hi Jay,

Lucky you, there was only about 17000 R390 made, which is way less than the 64000+ (some sources stating 140000) R390A. 
I have one and compared to the R390As, the capacitors within are of higher quality.
All those in mine are still good (all Sprague Vitamin Q sealed in metal containers) after all this time.
I only have to change some resistors that drifted out of tolerance (especially in the power supply chassis).
I recommend also that you begin searching for the 6082 regulator tubes if you don't have spares already.
All the other tubes types (except the 3TF7) can be found easily.
There is a lot of info available about the R-390 on the R-390 web site: just dig for it.
And yes, Motorola made a lot of R-390s for Collins, including ones from the first order number in 1951.

Good luck with it !
73, Jacques, VE2JFE