tubes age 199
Hope this provides you some insight to getting the most use out of the tubes
you have in hand.
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Date: Wed, 20 Jun 2007 19:36:58 -0400
Subject: [R-390] maintenance
I rotate my radios in order to keep the maintenance up on them, In the winter, I
run the R390's and summer I run the 390A's. As I was testing the R390 tubes, I
noticed one radio that needed an incredible 22 tubes.
These were all fine last year. The radio ran fine with all the bad ( really bad )
installed. Thats amazing. I decided I had better get out my spare tester, a Heath
TT1-A to verify the condition of the tubes and my TV7 All 22 tubes were just
totally dead.
My thought is last year the tubes still passed but were weak Then I ran them
non-stop all this winter. I think from now on, I will keep better notes. I do put a
sticker on the back of each radio to keep track of when the tubes were tested. I
just thought I would mention this to anybody that wondered how often to check
tubes.
My radios are most always on unless it is stormy and the tubes did not last as
long as others claim. Could it be the tubes are slowly dying even if not in use?
40 years of sitting on a shelf before use. Could all the magic ether be leaking
out?
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Date: Wed, 20 Jun 2007 19:58:38 EDT
Subject: Re: [R-390] maintenance
Running the R-390 24/7 puts a lot of hours on the tubes. Do you run any forced-
air cooling into the radio? Do the tubes have the black IERC-type tube shields?
Reducing the heat of the tubes should dramatically increase their life especially
when running them 24/7.
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Date: Wed, 20 Jun 2007 20:33:45 -0500
Subject: Re: [R-390] maintenance
Might be a case of high line voltage...or at least higher than the radio was
expecting... Years ago 126 to 132 would have been considered high...but is
fairly common place today. The radio is probably more comfortable at 110Vac.
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