[R-390] Re: R390 cooling fan

[Barry]

Let me respond to my own post here.  The sarcastic comment below makes it
appear I have a basic distrust of my government which I do not.  What I was
trying to say is that just because there isn't an official document stating
something doesn't mean it's not true.  Fifty years ago, the Collins
engineers used the information at their disposal and the results were what
we have in the form of the wonderfully designed radios we now enjoy.  The
fact they have held up and performed under the most adverse of conditions
attests to the fact that the design is indeed superior to other designs of
the era.

That doesn't negate the fact that things have changed since then.  Given the
fact that certain parts are becoming increasingly difficult to find makes it
necessary to seek good alternatives.  The case in point is the good old
3TF7.  While it's true that the function of this tube is not as necessary as
it originally was, you can't simply unplug it and expect the radio to keep
working so folks have sought out alternatives.

As for the present subject of cooling fans, I don't know if there is real
hard evidence to support the idea that keeping the tubes make them last that
much longer; however, common sense dictates that, generally speaking, the
hotter you get something, the faster it will wear out and it follows that if
I keep the tubes a bit cooler, then it's quite plausible that they will last
longer.  Given the fact that the sources for these tubes is dwindling,
cooling them to try and make them last longer is a very logical thing to do.

I suppose the real thing to keep in mind is that this is just a hobby.  If I
want to run a hundred fans on my R390A to keep it cool, and someone else
keeps a small heater next to theirs for whatever reason, what does it really
matter?

Sincerely,

Barry - N4BUQ



> So what you're saying is if the government prints it, it has to be true?
>
> Barry - N4BUQ
>
>
>
> > The shields all were standard silver and not black and they  operated
> > for years just fine and the biggest percentage of them still do not have
> > black shields. My guess some nit picking eenggiinnneeriinng smart ass
> > hole decided after 40 or so years that the Gov. should spend unknown
> > amount of taxpayers money to cool it down maybe 10 or so degrees.
> >
> > IIRC Nolan said in his 5 year test it made no difference.
> >
> > Where is the actual proof of the fans or black shields making the
> > receivers any more reliable.
> >
> > Proof I mean Gov./Collins printed hard copy dated and with the
> > appropriate numbers as a field Mod or SB. That would make TURDS a lot
> > easier to see.
> >
> > Hank
> > KN6DI
> >
> > AS Sgt. Friday  used to say "the facts Ma'am just the facts"
>
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