[R-390] R-390 b+ is fixed!

[frank hughes]

Thanks to the great advice and support of the folks here, the hamfest
mystery R-390 is now producing
a stable 180VDC B+!!

- checked R625 and R626, R626 was supposed to be 2.7K measured 4.5k!
(replaced)
- found one shorted 26Z5W, even though I tested in a TV-10, either I missed
the short test or ??? (replaced)

Bringing in the AN/USM-323 tomorrow to see if the R390 can read any signals!

Thanks and 73
Frank
KJ4OLL