Re: Fan speed control by OP of amp.
Ooh, what a lovely insulating box it lives in. What a nice, shiny panel holding the valves.With that thick walled box, you will need more, bigger vent holes than if it were sheet metal. Dull finished metal MAY help with greater radiation losses, though often not as much as "gut feelings" would suggest.
A fan blowing IN cold air will shift more air mass (hence more heat) than a fan drawing out hot air. (remember your gas laws).
Time for some thinking.
Les.
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