Hi,  Here is the information I've gathered from the name plates about
the pressure ranges of the Tangley Calliopes.  [Pressure is
pounds-force per square inch (psi), blower speed is revolutions per
minute (rpm).]  The info is arranged is this way:

Model/serial number/pressure/blower speed/tuning pressure

  A-43   #813    5/8 to ?       ?   3/4 psi
  A-43   #957    5/8 to 1      700    1 psi
 CA-43   #980    5/8 to 1-1/4  745  1-1/4 psi
 CA-43   #990    5/8 to 1      700  3/4 psi
 CA-43   #992    1/4 to 5/8    700  3/8 psi
 CA-43  #1180    5/8 to 1      700  3/4 psi
 CA-43  #1244    5/8 to 1      710  3/4 psi

The calliope plans by Bob Stanoszek say that the original operating
pressure of the Tangley was 5/8 to 1 psi.  He voiced them on 1 psi
pressure.

Dave Miner's Calliopes (info from his brochure):

 CA-43  -  air pressure:     1 psi
 ST-43 (theatre special):  1/4 psi

I was unable to gather any info about the original Tangley Theatre
Special models.  Thanks to everyone who sent me information.

Bill Black