It has been suggested that a fan blowing across the tube will make less
noise than a centrifugal fan, and therefore it is good to install such a
fan.
I thought blower noise was good. Have you ever heard an AC Cobra that was
quiet? Have you ever met an owner that complained about the noise of that
car? Or sell it to purchase a quiet electric car? And what about a Harley
owner? Ever seen a Harley with a after market "quieter" muffler?
And, what about the P-51 or P-47 screaming around the airshow circuit.
Would you come to watch if they were quiet?
A big blower on the linear amp is part of the attraction of high power amps.
Wind rushing into a good amp causes turbulance in the next room so that
papers must be secured with Budweiser cans (partly full). A good blower
causes the S meter to kick to S-9 before speaking a word and clears the
frequency of local chatter.
On the enforcement side, the blower noise can be recorded and cataloged just
like DNA, so that one of the owners could not come onto the frequency
without identification, even if someone else speaks.
And, if someone breaks into your house and steals the big 4800 pound amp -
with a lift truck and moving van, it can be identified later with a noise
print.
A good blower uses natural flow which causes heat to continue straight up
and has a vent with no elbows through the roof. On a normal day, the red
tail hawks will be seen spiraling in circles over the vent, using the heat
flow to gain altitude. What a glorious sight to be the only house in the
neighborhood with hawks circling overhead. The only problem is the occasion
when you bring a new baby poodle home. They always seem to disappear in the
back yard just before lunch time.
Colin K7FM
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