I've been working on a "modern" (1978) Standard player system. It has
the suction box with the die-cast top with four valves on it. I can't
seem to get it to put out more than 18" water gauge vacuum.
My little test box, which is nothing more than a simple vacuum box,
can easily do 30" on this piano, and up to 50" if not a lot of notes
are playing. Any suggestions out there?
I shortened the choke pallet, so it can open more, and I cut 1/8" from
the exhaust slot to reduce back pressure, but that only got me from
16" to 18." If I slide the Tempo lever to "0" I can get 20".
Frankly, I'm buffaloed! I'm thinking maybe I should get a new vacuum
motor unit -- and if so, any suggestions?
David Dewey
Oroville, California
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