Rodgers Concord 760 Voicing and lighted piston/stop replacement

[paul2169]

1) Is there a pot adjustment for the Mixtures?

2) This model has Walker enhancements. There is one card with 7 pot wheels and a toggle switch. What does this control? I managed to turn down the air puff on the other cards.

3) What are the steps to replace the lighted pistons.

4) For light bulb replacement on stops, are the wires unsoldered from the back of the stop assembly or are they cut near the stop face?

Thanks!

[toodles]

1. There is no separate adjustment for the mixtures. Mixtures can be set to the "loud" or "soft" volume, and the soft level adjustment is set on the individual keyer board (swell principal or great principal).
   .
2. The Walker enhancements are "inharmonic articulation"--I guess that is some sort of noise chiff.
   .
3. The entire lighted piston is replaced. You remove the key slip (strip of wood between the keyboards) by removing several screws, and then the old piston is pushed out, and the new one pushed in. Solder as the original was soldered. Syndyne is the manufacturer, but they might not sell to an individual. MCN Systems (google it) might have spares for sale.
   .
4. I believe at this age of production, the light bulbs had pigtails soldered to the lamps which are threaded through the drawknob stem. The drawknob head/stem is probably removable with a small Allen set screw on the bottom of the stem. You'll have to remove the mounting screws for the jamb and turn them upside down to access. There are probably 2 screws to release the jamb, one from the bottom of the key desk and one underneath the top of the jamb lid, angled into the side panel. The lid is removed by sliding it forward, and it may be with some significant forward force to get it to move. It is attached using a keyhole plate. Google that term if you aren't familiar with it is easier to show than explain, and it should be obvious how that system works.