I have found a flow restrictor in the 1933 Ampico B expression
regulator needle valve unit fitting.  It is only on the bass unit.
Should this be there or is it a "fix" installed to "solve a problem"?
I don't find a reference to it in any of my literature.

Bob Stewart
Kenosha, WI

 [ Excerpts from the Ampico Service Manual 1929 are reproduced
 [ at http://mmd.foxtail.com/Tech/Ampico/index.html  -- Robbie