[R-390] 4 R 390a with same issue

[Craig]

Hello Matt,

Those nasty R-390/A's!!! What will they do next?

Anyway, I have the original, "Too Loud Amelco", and have treated some
symptoms but not found the cure. Its audio issue could only be fixed by
using 5K pots in both the line & local gain values.

So to your challenge. Do the already mentioned suggestions in previous
threads. Check those carbon resistors, replace the electrolytic caps in the
audio deck, recheck the wiring harness for correct pin outs, shorts, opens,
& grounds for the umpteenth time. And so on............

A month or two ago the "Too Loud Amelco" cried for more attention. Local &
Line gain controls were affecting each other. Problems went away after
replacing both of the 5814A tubes in the audio deck. My tube tester said
good, but it only checks one triode section at a time. The tester would have
to test both triodes at the same time in order to see how the sections
affect each other. 

Hope you get it fixed.

Regards,
Craig
WD8KDG   

-----Original Message-----

From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of mparkinson
Sent: Saturday, October 21, 2017 4:53 PM
To: R-390 at mailman.qth.net
Subject: [R-390] 4 R 390a with same issue

Strange I have checked the wiring and controls compared to a known working R
390a receiver still have this weird issue.
The line level output control is turning the Local audio up and down. 
Now the strange part the Local audio control is adjusting the line output on
the line level meter. 
This should be straight forward trouble shooting Right.???? 
This is the 4 receiver I have come across having the same issue audio  deck
has been swapped out no change the wiring harness looks ok compare to
another known working radio. 
This one has me stumped for now.   
Anyone with some good Ideas ???
At first I thought is was some Military type mod maybe for the Navy on board
ship deal. 
No sure now. 
Matt P 

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