You're warping this into an argument for cooling for an entire amp
cabinet. That makes it seem like I was against that.
The original context was about a fan on the plate iron only. My point
was that if you have the B+ supply transformer sitting somewhere and
it gets so hot it has to have a fan on it, then it isn't big enough.
this is probably what would happen with a table top RF amp built for
SSB and CW but being run for AM or RTTY. I have no hesitation about
carving open the cabinet and setting some big transformer that will do
the duty out to one side, and using the fan for the RF deck.
73
Rob
K5UJ
On Sat, Feb 16, 2013 at 6:40 AM, Jim Thomson <jim.thom@telus.net> wrote:
>
> ## Nothing wrong with running a small, low speed fan in any HV supply. The
> temp inside the
> cab should be the same as the room temp. It’s worth it to keep the plate
> xfmr, hv electrolytics, bleeders,
> eq resistors, and any glitch resistor cool.
>
> ## I use filters over my 120mm fans... then push air into the cab. Then
> any warm air comes out the other side. That puts
> positive pressure inside the cab at all times.... which in turn always
> ensures a dust free environment inside the cab. I have
> a solid top for the hv cabinets. That way dust can’t get in through the
> solid top since it has no holes it.
>
> ## Those 7 watt, 65 cfm whisper fans are dead quiet. Easy to slow down if
> you want.
>
> Jim VE7RF
>
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