I have a 1959 Hammond B-3 organ and a 122 Leslie speaker. I changed all of the capacitors on the tone generator two years ago, because it was getting a bit dull. You can see some photos of the work here. I was pretty satisfied with the result, the changement isn't so dramatic as I thought. The only downsite was that it got a bit to sharp in the highs on a few frequencies. You can get capacitor kits from Goffprof.com I havn't changed any caps in the preamp, as I think that these old caps sound bether than new one, even thought they may have drifted away from their original value. I have just bought a B2 organ from 1950 with the original Hammond Tone Cabinet. The B2 is just like a B3 except for the lack of the percussion feature. The percussion is an effect that makes the upperharmonics attack and then go away (like a piano). The Hammond tone cabinet is like a leslie except that it hasn't got the turning horn. I often use the leslie on "brake" (that's when the horn is standing still) and that is the sound I will get from the hammond tone cabinet. Watch this movie at youtube.com of me playing the B2 just after it arrived in Shanghai. http://www.youtube.com/watch?v=lYQpwccHHYE

View pictures from changing caps on the tone generator Other B3 pictures more to come..