I don't know what the "recommended" blower is, but bear in mind slow
speed blowers can be much less noisy than high speed ones. They tend to
be physically larger, however. On some prior amps I used high speed
(2500-3000 RPM I think) blowers that were physically rather small. They
got the job done but were very noisy. On my current generation 4CX1500B
amps I use Dayton 2C647 blowers. They run at 1500 RPM, but move about
the same amount of air by using a larger squirrel cage. They are much
quieter. I suspect even this amount of noise would be objectionable to
many people but those blowers are far less noisy than the 4" fan in my
rack mount server case that houses the shack PC. Something has to be
done about that fan!
73,
Paul N1BUG
On 02/19/2014 11:07 AM, Jack C. Shutt wrote:
I have gathered from all the info that I have read on amps using
the GS-35b that a healthy air flow is necessary to keep these
tubes happy. Unfortunately, the 100 CFM squirrel cage blower
that is recommended for this purpose is quite noisy. Any
suggestions for an effective cooling arrangement that is quieter?
I thought about remotely locating the blower and using a hose
duct to the amp, but this is just not practical in my shack.
Suggestions? 73, Jack, W9GT
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