[Amps] Alternative cooling strategies for SB-220?

[Vic K2VCO]

Bill W5WVO wrote:
> And sacrifice 3 dB on these weak-signal modes where 3 dB is often
> the difference between "nil" and "solid decode"? If that's the
> only alternative, I'd rather listen to the fan noise. :-)  But I
> am looking into the possibility of quieter computer-type DC muffin
> fans that will move as much air with less noise.

That's what I did with my SB-1000. Here's a comment I posted at the time:

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In my quest for a quiet SB-1000, I replaced the fan. The original is a Nidac TA450AC, 
which is rated at 68 cfm and operates on 120vac. I replaced it with an ADDA AD1212LB3GL-LF 
which I got from Mouser Electronics. It's rated 72 cfm, operates on 12v DC, fits 
perfectly, and is *much* quieter. I followed the advice of N5OP and put a piece of 
hardware cloth (1/4" galvanized mesh) between the fan and the chassis to prevent RF from 
disturbing it.

It helped to remove the bolts holding the power transformer and slide it back. It also 
helped (a lot) to glue the nuts in place on the fan before installing it.
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I've been using the new fan for almost a year and am still happy with it.
-- 
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco