[ Bill Chapman wrote in 150607 MMDigest:

> A friend has problems with Wurlitzer 146 and Wurlitzer 153 in that
> both will not dependably turn off at the end of a tune or end
> of a roll.

Bill,  It was unclear what you meant by turning off at the end of the
song or at the end of the roll.  The Style 146 and 153 band organs have
no means of turning off after a song unless at some point it was
modified maybe to work with coins.

All the 153s that I have seen have duplex roll frames.  At the end of
the roll the pneumatic in the middle (the "rewind" pneumatic) collapses
and a clutch is engaged whereby a shaft turns and a cam on the shaft
puts one roll frame into rewind mode and the other into play mode.
Other than the rewind pneumatic there is no tubing that has anything to
do with rewind and replay.

The tubing from both tracker bars goes into a "duplexing chest".
One side gets vacuum when the organ is playing and the other side has
atmosphere.  There is a slide on the left side that moves back and
forth with the action of the rewind shaft to put vacuum into one side
or the other of the chest.  All of the tubes go into one side or the
other of the duplexing chest.

There are 6 places I can think of that could be the problem:

1. The tracker bar.  There is supposed to be a fine mesh screen between
the tracker bar and the wooden manifold.  If this is original there is
always a way, either with thumb screws or locking levers to attach the
bar to the manifold with the screen sandwiched in between.  Periodically,
especially with new rolls, these have to be undone, the screen taken
out and the paper chaff blown off the screen.  Check to see that the
chaff hasn't built up in the bar.  Face away from the organ and blow
this out too, then reattach.  It could be the rewind pneumatic isn't
getting it's signal to rewind the roll because of plugging here.

2. Chaff could already have gotten into the duplexing chest and the
holes are plugged that allow the signal to go to the rewind pneumatic.
Typically though chaff or other dirt finds it's way under one of the
pouches in the duplexing chest and cause problems where something works
all the time, either a note or whatever because air can bleed into the
line going to that valve from the side of the duplexing chest that is
not in play mode.

3. There could be a problem in the valve block that controls the rewind
pneumatic so that the valve can't seat when it's raised.  If there is
some tiny piece of something in there, sometimes the valve will work
and sometimes it won't.  Also look for a clogged bleed in the block.

4. A pouch could be blown and the valve won't work at all.

5. A block could not be screwed down to where it is air tight against
the chest, or the screws over-drawn to where they are stripped or have
crushed the block inside and cracked it.

6. Make sure the tubing going into the duplexing chest is air tight
where it enters.

The action of replay is entirely mechanical.  When the roll rewinds all
the way, the bottom spool is exposed and the replay "spoon" rides along
the bare spool until it reaches the notch cut in it.  It is knocked
back and causes the roll frame to go into neutral, waiting for the
other roll frame to go into rewind so it can then move into play.

Hope all this helps.

Tony Marsico