thaxton@ptgroup.com wrote:
> I'd like to hear from anyone who has constructed/ designed/jury-
> rigged, a fan speed controler for the tubes in their amp.
>
> I found a couple of squirell cage blowers that I'd like to adapt and
> control their speed for my amp. The oem blower does about
> 30cfm. The blowers I picked up are 50 and 60cfm blowers. I'd like
> to be able to control their speed and reduce their output when I'm
> just loafing, i.e. 500watts or less, and then have the fans crank up
> when I kick in more power, i.e. 600 to 1500 watts. All of this
> perhaps to be controlled by a temperature sensor above and/or
> around the tubes of my amp.
>
> Has anybody developed a methodology to do this?? Any help,
> pointers to info, real life experience, advice, would be appreciated.
>
> thanks....
>
> Don/N0FGK
>
I have used a series capacitor to slow the blower speed down. Then place
a temperature switch above the tube in the air path that will short out
the capacitor when things heat up.
73
Gary K4FMX
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