[R-390] R390 not A calibrator issue

[jgedde at optonline.net]

One of the last problems (apart from my B+ issue) I'm tracking down is a
non-functional calibrator.  If I pull my calibrator and connect its output
to my scope I get a strong 100 kHz signal out (after replacing a tube and
adjusting it.)  My adjustments consisted of setting the crystal oscillator
to 1 MHz using a frequency counter, then adjusting the multivibrator cap to
lock at 100 kHz.  I get a strong, reasonable looking 100 kHz sine wave out
on the scope

 

When it's in the receiver, I hear nothing.  I'm thinking there's an issue
either in the coax or the first RF stage.  Any ideas?  I'd rather not have
to pull the RF deck if I can help it.

 

John