[R-390] 4khz filters

[Bernie Nicholson]

I dismantled one of these filters the other day and found that the =
failure mode is that the filters are surounded by a type of foam ,rubber =
or plastic which has dematerialized and become sticky and corrosive and =
the wires to the transducers were damaged , I have over the years =
repaired abt 40 recievers and low gain in the 4khz filter is not =
uncommon luckily I found 5 complete 390a IF strips in a scrap yard many =
years ago and I have been able to keep my three rx s going , I have seen =
a site on the net where someone was supplying replacement filters and I =
think the link was from chuck rippels web site but they were not cheap =20


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