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I'm not able to help with the numbers, but maybe you can measure the
controllers you have now to get a ballpark?
Generally folks get an SMS-2 from Streetly or SMS-5 from Mellotron
Archives. These aren't cheap, and they require a bit of rewiring to
get them installed, but they work well. The SMS-5 has a high/low
speed option you can toggle while playing (think half-speed brass).
Usually the SMS controllers are "customer installable" if you know
your way around a soldering iron, provided that your power supply is a
standard one. Some power supplies--few, fortunately--aren't quite
normal and require slightly different wiring. Streetly or Mellotron
Archives can help you out with that. I ran into one of those once
long ago, but it was quickly sorted out by moving a wire or two
(sorry, I forget the details).
Now that you mention a DIY approach, has anyone ever considered
revving up an Arduino to sense the pulses from the tach head and
supply an apt voltage to the motor? Ya know, that might be
interesting (and way beyond my capabilities :-) ).
...kl...
On Wed, Sep 28, 2011 at 11:28 AM, arcsound <arcsound@...> wrote:
> I have a pair of M400s that have the original motor drive boards. They are in storage, but I would like to start restoring them now. One thing I would like to do is replace the motor drive board with something that does not sag, i.e. will support a couple of fistful of notes without slowing down. Does anyone have any data on the correct voltage range and the typical current draws for different numbers of simultaneous notes? There are a number of DC motor controllers on the market for industrial applications, and I'm hoping to find one to match up with the Tron's needs.