I have a 1936 Chickering Ampico B with an older rebuild.  The treble
plays too softly since the drier weather, but the bass plays fine.

Is there a regulation to increase the minimum volume of the treble end?
This model has the trombone-like 1st Intensity slide and not the two
big set-screws.  It seems to have enough suction.

Philip Jamison
Pennsylvania

 [ There is a small needle valve at a machined elbow entering the
 [ regulator chamber; it might be clogged, or possibly an intensity
 [ valve pouch has split.  Check the suction at the stack and compare
 [ with the data at the MMD Tech site,
 [   http://mmd.foxtail.com/Tech/index.html
 [   http://mmd.foxtail.com/Tech/Ampico/index.html
 [ "Ampico B Intensity Control System" & "Ampico B Intensity Scales"
 [
 [ In the dry winter I adjust the needle valves on my piano for best
 [ performance with the 1st Intensity adjuster slide all the way out
 [ (maximum air flow).  Then, when the humidity increases, the slide
 [ may be pushed in to compensate.  -- Robbie