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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