Melting finals

[rayfri]

reminds me of the time when i was a novice (late 60s).  had a couple of
friends who, just for the heck of it, decided to see what would happen if
they tried loading up a pair of 1625 tubes as close to a kilowatt as they
could get em HI HI.   they lasted about 30 seconds before turning bright
cherry red and melting down into a glob.....    that was when 1625's were
very plentiful and us young folk wanted to experiment with things.....
ray  wa7itz

mike bryce wrote:

> tom...
>
> you did not say if you were just sitting there watching your toes grow or
> working the 10 meter contest..
>
> if you were just sitting there, then you lost the bias voltage. first place
> to look is the output of the hp23 supply. if it is there, then one or more
> dropping resistors are no longer with us.
>
> on the other hand, if the tubes turned red turning transmit, then the
> problem is on the pi network. the final is not tuned... could be a lot of
> things from no antenna to the wrong antenna. a shorted band switch or a
> fault in the pi network output coils.
>
> that large pi network output coil does not change in value, but it has been
> know to develop a short when the wires rub off their insulation.
>
> Mike Bryce WB8VGE
> SunLight Energy Systems
>
> http://www.seslogic.com
> http://www.theheathkitshop.com
>
> "Electricity at the speed of light"
>
> > From: Thomas Beltran <tbeltran at EARTHLINK.NET>
> > Reply-To: Thomas Beltran <tbeltran at EARTHLINK.NET>
> > Date: Sun, 16 Dec 2001 11:32:29 -0800
> > To: HEATH at LISTSERV.TEMPE.GOV
> > Subject: Melting finals
> >
> > Last night, the finals on my SB-220 began to glow red.  I turned it off and
> > let it cool down.  Has anyone had that experience?  Tom W6EIJ
> >
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