[Amps] L7 Question

[R@contesting.com]

  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 at 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 at dxhunters.com
>
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Rich Measures, 805.386.3734, AG6K, www.somis.org