If you elect to stay with fans, I had good luck with fans from
acoustiProducts. (vendor http://www.siliconacoustics.com). I used these
for an OR application, trying to surgeons happy. They really were quieter
that :Standard" fans.

Hear a few of the other manufacturers of reduced noise fans. IMHO, you
really need to look carefully as the word quiet is very subjective.

Specifications for Panaflo and for Cormair Rotron Whispers are from
www.comairrotron.com

Specifications for NMB fans are from www.nmbtech.com

Specifications for JMC fans are from www.jmcproducts.com (good ANSI specs)

Noiseblocker fan specs from www.Blacknoise.de, but good luck finding the
fans in North America.

Verax fan specs from shop.erfrier.net (German). I'm not sure if they are
available in North America

Don


wrote in message
oups.com...
I'm the new proud owner of a R-390A. (Some will say I'm a fool but
I had to follow my heart!) It's rackmount, which is great because
I've got rack space. I want to keep it well fed and ventilated.

At the moment, the rack has a 10" EG&G/Caravel Rotron fan in the top.
It moves a lot of air and generates a fair amount of noise. Not
bad in a computer room, but I want to hear the radio instead of the
fan.

I anticipate keeping the R-390A on more regularly than my other tube
radios (Heathkits etc.). Probably several hours a day.

In addition, the radio probably isn't as thermally stable as it could
be if
I'm sucking lotsa air through it. Someone might tell me that it's
bad to use a fan for some other reason.

Which way to go? Speed control on the fan to slow it down and keep
it quiet? No fan at all, because the R-390A was designed not to need
it? Some vastly more quiet and appropriate fan?

Tim. (KA0BTD)