>>Actually - it also tends to change over time as the tubes get hot - and with >>the complete randomness between the speed, direction, and position of the >>horn and bin at any given point in time - it's very hard to even measure - >>much less reproduce well. Finally - no two setups ever sounded the same. We >>used to make jokes that a hammond and leslie never sounded good until they >>got beat up, had a few beers poured in 'em, dropped a couple times, etc.

Exactly, thats the beauty of tubes. The harder you push em, the more even order harmonics they produce and also when the output transformers saturate even more good things start to happen. This holds true only up to a certain point, but tubes due clip very softly.

Charlie