From holsen5629@aol.com Sun Jan 02 00:45:20 2005
Subject:Re: Bass rotorbag

<< It almost seems like you are implying that other than the wind noise
reduction you are not particularly ascribing any real differnces as to with or
without. >>

Not necessarily, Don Leslie was basically a tenacious, "seat-of-the-pants"
engineer without formal training. If there was a problem, he'd try various
"fixes" until he hit on something that worked. If a particular fix also solved
another problem, so much the better. Compared to current engineering
methodologies it was all very low tech.

Some 60s/70s Leslies like the 900 and 910 didn't have bass rotor covers even
though they had wood rotors. None of the later/current models with foam
rotors have covers. It doesn't seem to make that much difference. Incidentally,
Don Leslie's brother Bob designed the foam rotor. They've been used in 122 and
147 Leslies since 1977, and predate Ham/Suz, the Calo Corp., and the original
Hammond Organ Company.

<< Hmm- not even the 146Khz peak! >>

I assume you meant 146HZ. The bass rotor cover may have eliminated or
reduced a peak at this frequency. But that was not its intended purpose, which was
to reduce wind noise for broadcasting and recording.

Harvey Olsen

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