Fernando -- The only thoriated tungsten filament tubes that require a
pre-heat have water-cooled filament support structures. In Ham
stations outside Japan, these are fairly rare. Ordinary tubes like the
3-500Z are instant-on.
On Apr 26, 2005, at 7:32 AM, <ec1cwg@dxhunters.com> wrote:
> Hi there,
> I´m a proud owner of an old Drake L7 amplifier. It has been working
> out flawsely for 6 years here at my shack.
> Just wondering what would be a reasonable period of time to heat it up
> before applying any load. Since first day I got this amp, I let it
> standing by for 5 to 10 minutes and then switch it for low voltage
> (1800V) and run it for a couple of hours at low power (500 wts) before
> take it to its full output limit (1Kw). No problems so far but a few
> days ago I talked to a fellow ham with same amp who advice me to let
> the amp heating up for an hour or so. For me this would be so much
> time but I haven´t found any details about this on the manual that´s
> what I would like to ask here if you think I´m reducing the life of my
> 3-500s. Thanks and 73s!
> EC1CT Fernando
> E-mail: ec1cwg@dxhunters.com
>
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>
Rich Measures, 805.386.3734, AG6K, www.somis.org
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