[R-390] maintenance

[Cecil Acuff]

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.  A variac would take care of that.  Some radio's have various input 
taps on the power transformer and one can set it for the highest voltage 
available.  (but not 220)

Just a thought....

Cecil...
----- Original Message ----- 
From: "Scott Bauer" <odyslim at comcast.net>
To: "R-390 List" <r-390 at mailman.qth.net>
Sent: Wednesday, June 20, 2007 6:36 PM
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 
> dieing
> even if not in use? 40 years of sitting on a shelf before use. Could all 
> the magic
> ether be leaking out?
>
> SCott
>
>
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