3-500's

[GALE STEWARD]

As long as you have air on them, you can leave them on
forever. With out air circulation, the filament
pin-to-glass seals will overheat and leak.

73, Stew K3ND (owner of two 3-500 amps)


--- Neil Morrison <neilsmorr at HOTPOP.COM> wrote:
> I'd do it. Filament power won't hurt anything. When
> my grandmother got her
> first color TV set I rigged it so the filaments
> stayed on continuously. The
> thing ran for years and I never had to touch it -
> never replaced a tube in
> it - well worth a little extra power.
> 
> Switching the filaments on and off is what kills
> them. The first vacuum tube
> computers ran continuously like that too.
> 
> Neil
> 
> 
> ----- Original Message ----- 
> From: "Dave Leisman" <wb8baf at VOYAGER.NET>
> 
> 
> > I just purchased a pair of new 3-500 zg amplifier
> tubes, and I have
> > been told that they need to be "broken in", e.g.,
> that I need to put
> > them into their sockets, and turn on the amp for
> 10 hours of filament
> > voltage before applying any exciter power to the
> amp.
> >
> > Also, I was told that when I finally do apply
> power to the amp I need
> > to do so in increments of 10 watts, starting at
> the 10 watt level up
> > to a maximum of 100 watts.
> >
> > I'd sure appreciate some input here.  These tubes
> are expensive and I
> > don't want to mess these up, but on the other hand
> simply leaving this
> > amp turned on, and unattended, for some reason,
> makes me nervous as
> > well.
> 
>
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