Can anyone advise what the range of spin speeds for typical Leslie speakers might be ? Are the top and bottom speeds independently controlled ? Is the control parameter linear, or is it loaded to have more range at fast or slow speeds? Thx.
There are generally two fixed speeds which can be selected, the "range" you may hear is the ramping up or down of speed between the fixed speeds.
Horn and drum have separate motors, but the speed is selected for both not independently.
Horn and drum have separate motors, but the speed is selected for both not independently.
Thank you. Any idea of the numbers for the speeds, and how long the ramp takes in a bona fide Leslie ?
I found the answer on this site
HammondWiki - Leslie Rotation Speed
"When developing the PRO-3, ?JohnFisher measured his Leslie147. He found that the top rotor had a rotation speed of 400 RPM on tremolo and 48 RPM on chorale. This was with the belt in the middle pulley position and with a normal belt tension. The lower drum rotated at about 342 RPM on tremolo and 40 RPM on chorale.
SalAzz reports the upper rotor speed (middle pulley) to be 409 rpm, and lower rotor speed to be 396 rpm. Chorale speed is 48-49 rpm, for both upper and lower rotors.
DanDillon states the obvious for those who are stuck with digital simulacrums of the real thing and can't do the math for themselves: the "chorale" speed is about .8 Hz, and the "tremolo" or "lush tibia" speed is 5.7 to 6.8Hz "
HammondWiki - Leslie Rotation Speed
"When developing the PRO-3, ?JohnFisher measured his Leslie147. He found that the top rotor had a rotation speed of 400 RPM on tremolo and 48 RPM on chorale. This was with the belt in the middle pulley position and with a normal belt tension. The lower drum rotated at about 342 RPM on tremolo and 40 RPM on chorale.
SalAzz reports the upper rotor speed (middle pulley) to be 409 rpm, and lower rotor speed to be 396 rpm. Chorale speed is 48-49 rpm, for both upper and lower rotors.
DanDillon states the obvious for those who are stuck with digital simulacrums of the real thing and can't do the math for themselves: the "chorale" speed is about .8 Hz, and the "tremolo" or "lush tibia" speed is 5.7 to 6.8Hz "
Keep in mind that the original Leslie rotors spin in opposite directions if I remember correctly. If you plan on using this for guitar I find the slow speed a bit too slow. Its great for an organ with infinite sustain but for guitar it can be almost unnoticeable. I usually hear the single rotor Leslies and this may not present as big a problem with a dual rotor setup, I dunno.
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Also depends on if you are listening to the Leslie only or the Leslie along with the regular guitar speakers.
The old leslie mechanism had two motors, the fast and the slow. When the fast motor engaged, the inertia of the rotor assemblies caused it to take a couple seconds to ramp up speed. Due too the larger mass of the lower rotor compared to the horn assembly, the highs got up to speed faster than the lowers by some amount. And on slow down the same caused the lowers to take a moment longer to slow down. I couldn't tell you the time periods for any of that, just a few seconds.
The old leslie mechanism had two motors, the fast and the slow. When the fast motor engaged, the inertia of the rotor assemblies caused it to take a couple seconds to ramp up speed. Due too the larger mass of the lower rotor compared to the horn assembly, the highs got up to speed faster than the lowers by some amount. And on slow down the same caused the lowers to take a moment longer to slow down. I couldn't tell you the time periods for any of that, just a few seconds.
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