[R-390] No Headphones Audio

[gary.biasini at shaw.ca]

Greetings from the Great White North!

 

On an EAC 5570, all nicely cleaned up, I get no audio at all from the
headphone jack.  Totally dead. No hiss, nothing.  Tuning to known local AM
stations, the carrier level meter moves as expected and, with the line level
meter on, it bounces like it should to a modulated signal.  I attached
speakers to the line output and got audio!  I swapped the 2 6AK5 tubes, no
change.  I tested all 4 audio tubes with a Hickok RD 1575 tube tester and
all tested strong.  


I swapped out an audio module from another R-390a that I haven't yet tested
and got no audio on either headphones or line.  In checking the tubes on
that module, a 5814A tested dead so I replaced it and I then got audio on
the line output but not on the headphones, just like the original audio
module.  So, it appears that unless I have 2 audio modules with similar
issues, the problem may not lie in the audio module.

 

Any thoughts as to what I might check next?

 

Thanks in advance.

 

Gary