[R-390] 4kc filter

[D. ball]

well getting the filter apart was easy, i used a hot air rework station to 
do it, I could find nothing to indicate what the failure was. i even re 
assembled the filter, sweep it, then decided to take it apart again 
determined to find the fault but ended up breaking one of the little wires 
spot welded inside.. this filter case will get stuffed with ceramic filters, 
or maby a modern collins filter..   people have said the most used filter 
goes bad, ??   something took out my filter over time, not sure what it 
was..  sure was no foam to go bad, this collins filter had rubber supports 
inside.

as far as the PTO. it really make me question what causes that..  if you cal 
the PTO with the dial adjust at .000 and then move 300kc you notice you are 
off right?  ok, I move up to .700 and readjust, same result, dead on fo 
about 300kc either way.  because of this i question the the gear train, I 
think a pencil mark on the shaft of the PTO will tell me what is going on, 
it is very possable that this is the gear box and that the adjustment  you 
made in the PTO makes up for that..  just a thought..  something like this 
does not bother me.. I can always re-cal the pto then tune in. but the 
filter really bugs me, the most amazing thing about the r390a is it's 
ability to hear a station a few kcs away from a powerful one, i have never 
heard a radio do that.. not like this thing, plus you can hear the collins 
filters, it really sounds good, I have found pleanty of replacements, just 
bums me out the 4kc filter is gone..  i just bought this radio..   great 
shape..  just out one filter..

ok,
thanks

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