>I've been using the Kooltronics blowers
>for some time in various amps. I have a
>drawer full of Dayton blowers that are
>so far out of balance that they will
>walk themselves off the bench when
>running.
I bought a Dayton blower for my 70cm amp. It was a mover and a shaker.
I balanced it myself. It runs hot enough to brew coffee.
>The only problem with the
>Kooltronics centrifugal blowers is that
>the smallest one, (KBB25) is almost
>overkill for 1500 watts SSB in low back
>pressure designs.
Agreed, but for RTTY and 3wpm CW, it is plenty good.
>On the smaller
>blowers the motors may be balanced but
>the wheels are plastic and don't appear
>to be balanced after manufacture but are
>quiet. The price of these blowers IS
>painful but not having to worry about
>them once installed is worth it.
Amen, Paul. As I understand it, the price plummets if one buys in a
10-up quantity. If I had less mileage, I would sell them via my
retrofit-kit mail order business. / The Kooltronix high-pressure
blower I bought had surprisingly little vibration and the cap-run motor
ran Kool even with free-air delivery. I would like to see Kooltronix
come out with a line of high-pressure blowers that use 28v DC-brushless
motors -- so that one could control speed (and noise) in proportion to
anode temperature. A controller circuit can be built from a transistor
and a thermistor plus a few resistors. [note -- capacitor-run motors are
synced to the line-frequency, so they are virtually single-speed]
cheerz
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
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