[Amps] Can I cool too much the tubes?

[Jeff Blaine]

Gentlemen,

If I'm not wrong, on the glass tube, there is only an incremental benefit to 
the air circulation - the anode dissipation happens primarily by radiation, 
not conduction, and I think that means that little of that radiation is 
absorbed by the glass.

Air circulation does help to keep the pins, cap and envelope from 
desoldering, but it does little to improve the anode dissipation capability 
as is the case with a metal variety.  And I don't think that the plate cap 
is very effective as a disipation mechanism because the thermal resistance 
of the anode lead has got to be high.

So the caution should be - yes, air is good.  Very good.  But if you are 
heating the anode to a temp beyond it's specification, the degragation in 
the condition of the anode is going to be happening no matter how much air 
is blowing over the envelope.

73/jeff/ac0c
www.ac0c.com


--------------------------------------------------
From: "k7fm" <k7fm at teleport.com>
Sent: Monday, August 16, 2010 9:08 AM
To: "Rudy Bakalov" <r_bakalov at yahoo.com>; <amps at contesting.com>
Subject: Re: [Amps] Can I cool too much the tubes?

> Is there a risk of running the tubes too cool if I have a much higher air
> flow?
>
>
> You would suck (or blow) the tubes out of their socket before you cooled
> them too much.
>
> Air is your friend.  Plenty of air is your better friend.
>
> 73,  Colin  K7FM
>
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