[Amps] What blower?

[Bill Turner]

ORIGINAL MESSAGE:

At 06:58 PM 1/27/2006, Bob Selbrede, K6ZZ wrote:

>This brings up a good point.  How does one go about
>determining how much airflow a set of tubes require and the
>backflow they create?  Is that info normally found on the
>tube spec sheet somewhere?  What does a pair of 3CX800A7's
>require?
>
>Thanks, Bob


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The only true measure of cooling power is the temperature of the tube 
as specified by the manufacturer. Typically they will list different 
temperatures for different areas of the tube. If you don't exceed 
them, you have enough air.

One way to measure tube temperature is with special paint, label or 
crayon that changes color at a specific temperature. One nice thing 
about them is you can put multiple spots on the tube and read them 
all later, as opposed to trying to take real-time measurements in a 
hazardous environment.

McMaster-Carr has them and no doubt others do too. Search for 
"temperature indicators".

73, Bill W6WRT