Hello everyone, Steve Dean mentioned a problem with his new restored
Wurlitzer 105 with Wurlitzer 4-in-1 metal valves.

Needless to say everything must be 100% air-tight for any pneumatic
system to operate correctly.  The Wurlitzer system is looking for
trouble with it's system of a removable tracker bar.  The slightest
leak anywhere between the paper music roll and the pouch will allow
the pouch to float a touch which, of course, raises the valve a touch,
allowing the vacuum in the stack to leak out.

The bleeds are designed for a system that is 100% air-tight and leave
_no_ room for any deviation.  The vacuum pumps, if restored 100%,
should actually lock up if the air inlets are sealed.

Often leather is used when restoring the pumps which is not actually
air-tight under pressure, so all leather _must_ be treated to make it
airtight.

I have also seen where Wurlitzer made the vacuum reservoir rock-hard
by using three internal springs or, like the Artizan/Wurlitzer I am
presently restoring, adding an external coil spring arrangement to
bring the vacuum even higher on start-up.  This made the pumps remove
all of the air in the stack, etc., before the reservoir came into
action.

This is just a few of a dozen or so other items, but a place to start:

1. Be sure vacuum pumps operate 100%.

2. No leaks between tracker bar and pouch, such as where lead tubing
and wood join.

3. Restore the 4-in-1 valves completely with new pouch leather (sealed)
and paper gaskets.  Measure each valve carefully.

4. Bench test with the stack tubed to organ to really troubleshoot
where the problem is.

Hope this shines a little light on what all could be the problem.
If not let me know more of what has been done in the restoration.

All the very best,

Ron Schmuck - The Great Canadian Nickelodeon Co. Ltd.
Mount Forest, Ontario, Canada
http://www.nickelodeonco.com/