Some builders water cool these tubes. It that an option?
-----Original Message-----
From: N1BUG <paul@n1bug.com>
To: Jack C. Shutt <w9gt@frontier.com>; amps <amps@contesting.com>
Sent: Thu, Feb 20, 2014 9:27 am
Subject: Re: [Amps] Fan Noise in GS-35b Amplifiers
I don't know what the "recommended" blower is, but bear in mind slow
peed blowers can be much less noisy than high speed ones. They tend
o be physically larger, however. On some prior amps I used high
peed (2500-3000 RPM I think) blowers that were physically rather
mall. They got the job done but were very noisy. On my current
eneration 4CX1500B amps I use Dayton 2C647 blowers. They run at
500 RPM, but move about the same amount of air by using a larger
quirrel cage. They are much quieter. I suspect even this amount of
oise would be objectionable to many people but those blowers are
ar less noisy than the 4" fan in my rack mount server case that
ouses the shack PC. Something has to be done about that fan!
73,
aul N1BUG
n 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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