Thanks to all who replied , I have been doing exactly that , what a great
amplifier ! now I have a new dummy load I am gonna have to learn good
operation proceedure with that. thanks all John
----- Original Message -----
From: <jsb@digistar.com>
To: <tentec@contesting.com>
Sent: Thursday, December 18, 2003 1:19 PM
Subject: Re: [TenTec] warming up of tubes
> On Thu, 18 Dec 2003, John wrote:
>
> > Can any one tell me how long must I allow the tubes in my centurion warm
> > up before use ?
>
> I believe the official spec says 3 seconds however I would wait at least
> 5-10 seconds for the filaments to get to full intensity. By the time the
> fan gets spun up to full speed you will have given everything a chance to
> settle down. Personally, I wait 60 seconds to minimize thermal shock and
> stress - I probably don't have to but it makes me sleep better at night.
>
>
> It's more important to let the unit cool down for at least 5-10 minutes if
> you've been using it at high power or lower power with long key-down
> times. If you turn the unit off right after finishing a long QSO the heat
> will find its way to the pins and seals at the base which is one thing you
> do not want.
>
>
> It's just like a car engine - let it warm up before you gun it, let it
> cool down before you shut it off.
>
>
> 73 Jason N1SU
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