[R-390] EAC R-390A parts needed

[Dave Merrill]

I think the evidence is pretty good that IERC tube shields reduce
internal tube temperatures and prolong tube life.  Collins did 
employ them on later tube gear.  Can't fault earlier engineers 
for using components that were accepted practice, but when something
clearly better appears, why not use it?

BTW, was Nolan's radio from an early Collins contract?  IIRC, it was
a '67 EAC with IERC shields.

/dave
N9ZC

>I find it extremely interesting that after Collins designed these GREAT 
>radios and they were built to work 24/7/365 with covers, shields, 
>adverse operating conditions, voltages all over the scale, vibration and 
>i could go on forever.
>Then the radios became available to to public domain, then all of a 
>sudden a whole new bunch of WANNABEE redesign engineers come up with all 
>of these far out theories and solutions to further their case or mostly 
>their pocket books to sell the SS replacements for a perfectly working 
>ballast tube or to enhance the audio, which is fine. It was not designed 
>to be concert hall performer. It was designed to listen some of the 
>worst signal reception signals in the world for the state of the art at 
>the time.
>Covers and shields were there for a reason.
>The Spec's say how and where the radio was DESIGNED to OPERATE.
>The enhancements help to some extent.
>
>We all remember our lost somewhere in the Louisiana swamps Nolan Lee and 
>his radio that ran over 7 years 24/7 with out a 3TF7 failure and with 
>voltage fluctuations up and down with covers on and all shields in place 
>with it meeting the same spec's (period)
>
>Recap yes. align yes, then plug and play and pass it on to first your 
>born still running.
>
>IF IT WORKS WHY FIX IT????
>
>My .0002 worth.
>
>Hank
>KN6DI
>
>
>
>_______________________________________________
>R-390 mailing list
>R-390@mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/r-390