Paul Christensen wrote:
>> Given the high temps a tube can run at,
>> it's conceivable you could design a pump-less cooling system based on
>> convection currents and steam.
>>
>
> That's the basis for the 1966 QST article entitled "The Stanley Steamer."
> That amp used only convection currents as the condenser was positioned
> horizontally and became a part of the top cabinet. The Alpha Seventy uses
> convection + the assist from a whisper fan as the condenser is oriented
> vertically and forms part of the rear panel.
>
> Convection vapor cooling in small amps normally uses a vented system and as
> such, H2O is exposed to the ambient air
Only to a small extent.
> -- and hence my reference to the
> Florida climate for those scratching their heads wondering why the Florida
> climate would have any effect on H2O purity.
You should not see any humidity escape the system except possible a
small amount at at startup.
The system uses a condenser that allows for pressure changes, but it is
essentially a closed system. Converting most external anode tubes to
vapor phase cooling does not normally eliminate the need for forced air
cooling of the seals.
> I've not seen a completely
> closed and *unvented* vapor-phase cooling system that uses a pump, but they
> may exist in larger applications.
>
>
As I said above, they are essentially closed systems that are vented for
pressure relief and safety. That vent normally plays no part in the
cooling cycle.
73
Roger (K8RI)
> Paul, W9AC
>
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