Work on the Hammond T-422

Some nice weather today so I did some work on the Hammond.  This beast is way to heavy to carry around and I don't really have room for it in my house so my current plan is to modularize all of the individual components.  These are some shots of the built in Leslie unit.  The cylinder is made of what appears to be a polystyrene or related polymer although it seems a bit tougher than styrofoam.  Looks like a two motor system.

Is that about a 5" speaker?  Maybe that could be upgraded.  Thinking about a using a stepper motor for this but I might not be able to get enough torque.  Either that or build a preamp and power supply for this and mount it in a separate cabinet.

Started cleaning all the gunk off this board and discovered it is the drum module.  This was still working during my initial test.  Found a piece of wire or solder underneath this board which may have resulted in some shorting.  Needs more cleaning.  I was originally thinking of trying to rig this up to a techno style drum machine.  Maybe I can convert those trim pots to knobs.  I may have to reflow the solder on a couple points.

Reverb tank looks intact and has standard connectors.  I think I will try it out with my Blues Jr.

Hammond T-422

I went to the Grace Lutheran Church thrift sale and this was listed as free.  I figured since it seemed to have drawbars it might be worth picking up.  A model T-422.

Sort of interesting that it has a built in leslie, although no connection for an external Leslie.  I may be able to hack something on this once I figure it out a bit more.

Found some schematics over here: http://captain-foldback.com/Hammond_sub/hammond_schematics.htm