[Amps] Air Chimneys for 3-500Z and Anode Dissipation

[Randall DuCharme]

--- Kim Elmore <elmore@nssl.noaa.gov> wrote:
> Talk of blower capacities lead me to wonder about
> glass envelope 
> tubes.  Here are some of my questions:
> 
> I've never seen an air chimney system used on
> 3-500Zs.  Yet, Eimac 
> specified the dissipation values given that their
> air socket and chimney 
> was in use.  In reality, how well does the standard
> method of blowing air 
> across the tube work in comparison?  

I have a Henry 1KD-5 that uses a single 3-500Z with
achimney and a squirrel cage blower system.  It's been
my understanding cooling the bases/pins of these tubes
is very important that adequate cooling in this area
can't be realized just by blowing air across the
envelope.  I have much to learn myself but a couple of
my local elmers claim to have melted the solder out of
the tube's pins due to lack of sufficient cooling.

Just my 2 pennies worth.



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