I built a Leslie (rotating drum using factory unit out of old Thomas Organ) using the factory motor for my guitar rig (SRV -Stevie Ray Vaughn tone) . Is there a simple circuit to control the speed that will be reliable? I have used a Hardwick Hindle Inc ceramic type # KS-8852 L20 600 ohm .288 amp series 5A rheostat controlling a 117 volt 60 cycle 35 wt AC motor and it works. I have ran it for a minute at approx half speed and neither motor nor rheostat get hot but I will use this at least 45 minutes at a time. Thanx