[R-390] I Hope Everyone Is Happy Now....

Sun, 17 Feb 2002 23:13:51 -0500

Hi,

If you have air in the ballast tube the iron wire burns up. I guess you
could also say that it rusts. Either way it converts to iron oxide and stops
working.

Nicrome probably has to flat a temperature characteristic to work well in a
ballast tube. Copper goes at to low a temperature. Iron is just right .....

    Enjoy!

        Bob Camp
        KB8TQ

----- Original Message -----
From: "Barry Hauser" <[email protected]>
To: <[email protected]>; <[email protected]>; <[email protected]>
Sent: Sunday, February 17, 2002 10:23 PM
Subject: Re: [R-390] I Hope Everyone Is Happy Now....

> > Way back when, before the internet,
>
> Was there life on Earth before the Internet?  I can't seem to remember.
> Vaguely recall staring at some kind of screen for hours on end, but there
> was no keyboard. ;-)
>
> > I couldn't find a spare 3TF7 when the one
> > in the radio died.  I cut open the top of the tube, pulled some nichrome
> wire
> > from an old wirewound pot, and wrapped the wire around the glass
envelope.
>
> That sounds interestin' ....
>
> > This homemade resistor has been working for at least 20 years.  Who
needs
> a
> > high-vacuum pump anyway!
>
> Not for ballast tubes - they're supposed to have iron wire and be filled
> with hydrogen, not a hard vacuum.  Not sure if the hydrogen needs to be
hard
> or regular.  I suppose you have to make sure there's no air mixed in it.
> Dunno if it would blow up or fog up.
>
> Barry
>
>
> > Ed
> > _______________________________________________
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> >
> >
>
>
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