[T3] MPS calibration

[Bryon Garvin]

>>>"No, only the '70-1 Type 3 PSs have the diaphrams. The diaphram type
PSs are easy to pick out; just look for the 2 vent slots in the
cover."

One of my PS's on the shelf, which is a "C", has holes instead of slots.  Is
that an indicator of anything?

 - Bryon, '71 Fastback
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