[R-390] R-390 Antenna Relay Chatter

[Barry]

When in STANDBY, the antenna relay in my R-390 produces a bit of chatter.  Is this normal?  I see where that relay is fed, unfiltered, from CR801 which, from the pictures in the manual, appear to be a stack of selenium diodes and I'm wondering if that rectifier stack might be a problem.  Anyone know what to expect from that relay in STANDBY and, perhaps, what I'm seeing might be normal?

Thanks,
Barry - N4BUQ