Thanks for all the help and advice. Although muffin fans on top will
help clear hot air out of the case, the off-list consensus is that they
won't do much to cool the valve seals. A big muffin fan might be useful
for pushing air into the existing L4-B fan, so long as the air is
"de-spun" with baffles. For me, the easiest (if ugly) short term fix is
to remove the existing impeller and bolt a junk box blower to the back
of the amplifier.
Of all the suggestions, this one looks the most promising
>Date: Wed, 28 Dec 2005 21:37:03 -0500
>From: Jason Buchanan <email@example.com>
>I'm holding in my hands (well not as I type this but I was holding it) a
>Dayton 4C761 fan (see pictures at
>The Dayton 4C761 fan is rated at 50CFM, 2840RPM, 115VAC 60hz.
This should blow a whole lot more air than the existing 1550 rpm blower.
I'll have one of my work colleagues ship one over.
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