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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