[R-390] R-390/URR FanPlate

[Gord Hayward]

>
>
>I agree with putting a "sand" resistor in series with the power lead to the fan.  I've done "similar" installations with other tube radios.  The slower speed does not reduce the cooling effects.  It DOES make things less noisy and reduces the vibration aspects.
>

I used a capacitor (a few uF at lots of volts) in place of the 
resistor.  Worked well and didn't
get hot (imaginary "Wattless" power and all that stuff).  Now I just use 
240 volt fans and get
the same result.

Cheers, Gord, VE3EOS

-- 

Gordon L. Hayward, Ph.D., P.Eng.,
Associate Professor, Biological Engineering,
School of Engineering, University of Guelph,
Guelph, Ontaro, N1G 2W1.