[Amps] Fan for SB220

[donroden at hiwaay.net]

If I ever go into it again, I may add a two layer heat shield to  
double the surface area the fan can cool.

Don W4DNR





Quoting Steve Thompson <g8gsq at f2s.com>:

> It's not surprising that the sides facing each other should get
> hotter than the rest - but a metal screen won't help by shielding
> heat. If it's shiny it just reflects the heat back and if it's
> black it radiates the heat out as efficiently as it absorbs it -
> either way the effect is neutral. If it helps, I reckon it's
> because it acts as an air cooled heatsink, transferring some heat
> into the airstream.
>
> Steve
>
>> Bill:
>>
>> I think Don was mostly wondering about heat.
>> I had a Collins 20V2 broadcast rig that had a
>> pair of 4-400s that "talked to each other" in
>> terms of heat.   The two tubes weren't all that
>> far apart and the sides of the plates that faced
>> each other were more colorful than the "back
>> side" of the plates.
>>
>> But I agree with you about RF.   A non-issue.
>>
>> - JimT
>>
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