Nice thread on the vapor cooled Eimac tube, but I have an experience I'd
like to share and see if anyone can comment. Some time ago I had occasion to
work on an Alpha 374 amp. This amp has a pair of 3CX400's (8874's) That is a
total plate dissipation of 800 watts similar to a single 3CX800. Anyway,
this Alpha 374 cools these 2 tubes by pressurizing the entire RF compartment
with a large muffin fan, the only air escape is through a hole in the small
chassis that the tubes are installed on and then up through the tubes and out
the top of the cabinet. This amp does not use a blower per se. The question
is could a muffin fan cool a single 3CX800 tube "if" the fan was mounted
right under a chassis that housed the tube socket and then the only means of
escape for the air was up through the fins of the tube? I understand the
concept
of air flow and that a back pressure is a factor, but in this Alpha amp it
seems to work. Lou
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