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For a quieter environment -
I recently replaced the original fan in my 22 year old SB-220 with the
Harbach higher volume replacement. It appears to be much better quality with
better design and the claim is 30% more air volume. The increased air
volume seems to be more than 30% and the increased noise volume appears to
be a lot more than 30%. Alan said he hardly ever makes up new replacements
in the original configuration anymore. (I guess everyone wants bigger,
better, faster and more powerful.)
If the amp sat on the floor like the computer I would not notice the extra
noise. Sitting on the Big Ham table, the extra fan noise along with the
computer and window air conditioner noise is too much for ears earlier
thought to be indestructible.
On the rear ledge under the fan I Gooped a 33 ohm, 10 W. wirewound into the
117 V. circuit. I drilled and installed a little toggle switch in the back
panel to bypass the resistor for maximum fan volume, if needed.
The aging 220 is back to the normal fan air flow and lack of the extra noise
which I prefer for SSB.
Bob, N5CNN
bhut@nol.net
713 467-0077
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