>W7CW Jay E Ostrem wrote:
>> This may be an over simplification, but I think Rich is alluding to
>> Let's say you are measuring back pressure on an installed tube,
>> utilizing a
>> manometer. It seems to make sense that if the back pressure is correct
>> the altitude, then the cfm should be correct also.
>> It should be possible though that you can reach a point where the tube
>> cannot pass anymore air, but the back pressure will increase.
>While its probably true that if the pressure is okay, then the flow is
>too *if you use the correct bases*, you can not apply this if you make
>your own bases, which many amateurs do. Neither can it be applied in
>the case of some of the triodes (3CX5000A7, 3CPX5000A7, YC156,
>3CX15000B7) and others, where you need to cut some slots in the chassis
>for air flow.
It can if one measures the differential pressure drop across the anode
cooler with a manometer.
R. L. Measures, 805-386-3734, AG6K
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