[R-390] Continuing R-390 Problems

[David C. Hallam]

Opps, I hit the send button accidentally!

As I dig more into the innards of my R-390 in an effort to uncover the
source of my low sensitivity problems, things become more confusing.  To
show the degree of low sensitivity, this afternoon WWV on 15 MHz was 20 over
S9 on my 75S-3.  With the R-390 on the same antenna, I could hear WWV but it
was so weak that the carrier level meter did not move off of 0.

Following the alignment procedure in the manual, I find that when I adjust
the cores in T502, 2nd IF transformer, something breaks into oscillation.
Anyone have any ideas about that?

David
KC2JD