Melting finals

[Dave Edwards]

So how close to 1KW did they get??
...Dave
----- Original Message -----
From: rayfri <rayfri at NETWORLD.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Sunday, December 16, 2001 5:47 PM
Subject: Re: Melting finals


> 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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