I am currently working on a 1933 Ampico model B Marshall and Wendell.
I believe it is a transitional piano due to the fact it has no
adjustments on the striker pneumatics.

The piano plays fine with all the tests on the Ampico B test roll.
The customer has mainly Ampico A rolls and would like to play these.
I tried these rolls -- they do have expression, however they play
much softer then they should.  I have rebuilt many model A Ampicos,
however this is only my second model B.

I'm thinking about possibly running a switch to the 0B hole [Trigger]
for playing Ampico A rolls and standard rolls, or possibly using the
modify switch to open the 0B hole for these rolls, or possibly running
a tee to the stack spill valves.

My questions are as follows:

1) Is this problem normal when playing Model A rolls on this instrument?
2) What is the easiest way to increase volume on standard 88-note rolls?
3) Should I continue on my current way of thinking, or maybe focus on
the curtain grid of the main pump?

This piano has come to me in parts, after several so-called technicians
tried to make it play.  Needless to say I have a few less hairs on my
head then when I started.  I appreciate any help or wisdom that anyone
has in confronting this problem in the past.

Thanks,
Mark Washek - Lancaster Keyboard Center
Lancaster, Ohio

 [ Bob Taylor's Ampico A to B Translator is demonstrated at
 [ https://www.youtube.com/watch?v=449hUeHYd1Y
  and described at
 [ http://www.aeolianorgan.com/Ampico_Translator/Ampico_A_to_B_Translator.html 
 [ -- Robbie