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MMD > Archives > September 2010 > 2010.09.03 > 07Prev  Next

Wurlitzer 153 Pneumatic Problems
By Matthew Caulfield

In Jeff Bryner's description of his new problems with his Wurlitzer
153 band organ he repeatedly speaks of a "pneumatic."  It is not
very clear what he means by that term, but it sounds as though he is
referring to a valve block (unit block).  If a valve block is operating
properly, it would depress a finger pneumatic, which would in turn open
a pallet in the wind chest and admit pressurized air into a channel
feeding a pipe or pipes, causing the pipe(s) to sound.

His earlier report indicated that he has not played both of the two
roll frames in his 153.  He doesn't make it clear in this latest
trouble report whether that is still the case or whether he has been
using both tracker bars, and if so, whether the problems manifest
themselves in using both tracker bars.

Jeff has to realize that in dealing with a dual roll frame organ, he
is dealing with an array of pouches (twice the number of pouches as
the number of holes in his tracker bar, i.e. 108 pouches) that comprise
the transfer chest, controlling which of the two tracker bars is
operational and which is sealed off.  The presence of the transfer
chest in the system may be compromising Jeff's testing-by-blowing to
see whether the hoses (tubes) are patent from the valve block to the
tracker bar.

I will be interested in other input here about Jeff's problem and
perhaps better suggestions on how to diagnose the source of the
problem.  Repairs are often very simple; the art is in diagnosing them.

Matthew Caulfield
Irondequoit, New York

(Message sent Fri 3 Sep 2010, 21:54:19 GMT, from time zone GMT-0400.)

Key Words in Subject:  153, Pneumatic, Problems, Wurlitzer

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