[AMPS] [amps]Emtron fan problem

[Frank & Barb Ayers]

Jorge wrote -
>The air flow generated by the fan   is not sufficient to keep
>the tetrode at  safe operating temperature which in turn causes the
>protection circuit  to come on all the time (amp does not go on txmit).
>My qth is 7000 ft above sea level. The stock fan is about 103CFM

Hi Jorge
Your fan may do 103 CFM but at what backpressure? I seem to recall that at
6000 ft a 4CX800 needs 35 CFM but at around  6/10 inch pressure. If your amp
doesn't use a squirrel cage (centrifugal blower) I'd look for a way to put
one in.

Frank
W2FCA



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