Quoting Mitch Cox <ww4cox@embarqmail.com>:
> Not to try to be argumentative but this only proves the bare minimum
> of cooling that exists under the tube deck. If you doubt this, turn
> the fan off and see how long the solder lasts in any of the pins. If
> you have a slightly resistive connection with enough air, chances
> are you would never have known it.
And remember, small CPU fans weren't available to use as "booster"
fans on the filament pins. Now,with a little fabrication, each tube
can have it's own filament pin cooler.
Don W4DNR
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