[Amps] Fan for SB220

[Steve Thompson]

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
>