>
>--- 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.
>
? to test the cooling on the filament seals, after about 5-min. of
standby, briefly touch one of the filament pins. If it's painfully hot,
the cooling is not wonderful.
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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