[Amps] Testing amp with no air flow

[k7rdx]

I just checked fil voltage on my 8877 here (No blower ) watched it ramp-up
to 4.9vac in less than 10 secs and then pulled switch...No heat felt on tube
base in this short time interval...What`s the big deal unless you want to
test with rf conduction?(I do that too but with blower running&safe
connections) Jim K7RDX..
----- Original Message ----- 
From: "Ian White GM3SEK" <gm3sek at ifwtech.co.uk>
To: <amps at contesting.com>
Sent: Thursday, October 19, 2006 6:17 AM
Subject: Re: [Amps] Testing amp with no air flow


> Rick Stealey wrote:
> >I will soom be ready to apply power for the first time to a homebrew 8877
> >amp.  I need to make adjustments under the chassis with the tube filament
> >lit and was wondering how long I can run the 8877 with just filament
voltage
> >applied and no air flow?   I don't see the subject addressed in the Eimac
> >spec sheet.
> >
> I can't answer that question directly, but how about stretching clear
> Saran wrap over the base of the chassis?
>
> It balloons up alarmingly, but it keeps the air in, lets you see what
> you're doing, and it's no problem to poke screwdrivers and trimming
> tools through it (the small holes they make don't affect the cooling).
>
>
> -- 
> 73 from Ian GM3SEK         'In Practice' columnist for RadCom (RSGB)
> http://www.ifwtech.co.uk/g3sek
>
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