> Well I reinstalled a muffin fan on the back of the
> Swan Mark 1. I fused it seperately from the amp so I
> would not blow fuses in the amp.
>
> //A 10W fan (83mA at 120Vac) is going to blow fuses in the amp??
>
> I checked the air
> flow out of the amp using only the internal fan, then
> hooked up the muffin fan for a comparison. The
> addition of the muffin fan sucking hot air out of the
> amp does move a lot more air than just the internal
> fan alone. Maybe the hot air didn't do anything to
> make the fan fail, I'll see with this new one.
>
> Not scientifc by any means as I didn't use a
> calibrated kleenex to check the air flow differences!!
>
> //Interesting observation. Problem is, the test doesn't mean much without
> measuring the difference in air flow around the components you're actually
> trying to cool, like the 3-400Z's. Often, when additional exhaust cooling
> is in place, the obvious extra air flow volume is due to sucking air from
> places it needn't be. So, there's lots of extra air exhausting, and the
> air will feel much cooler than the "original" air exhaust, but that
> doesn't mean anything with relation to tube envelope and pin seal
> temperatures, which are the only important ones.
>
> //-WB2WIK/6
>
>
> 73,
> Bill
>
> =====
> Bill Smith KO4NR
>
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