[Amps] tube cooling

[Tom McDermott]

A basic problem is that most types of fans move a greater volume of air when
working against a backpressure than they do when working against a
backvacuum.

When working against a significant backpressure, a squirrel-cage type blower
will usually move a lot more air than an equivalent muffin fan type blower.

	-- Tom, N5EG


> Could you wise old sages help me with simple question - I seem to recall
> hearing that forced air cooling was not the same as, shall we say, sucked
> air cooling.  Do I remember right?  Seems you could destroy your amp if
you
> tried to suck the air through the tube(s) tops as opposed to pushing it
> through from the bottoms.
> 
> Advice please.  Thanks in advance.
> 
> Mark, N5OT