Wireless Set No. 52 Canadian - Project

[David Dunlop]

I received a really helpful email and set of photos this morning from Chris B. in Ottawa, who owns a working 52-Set.

I had asked him before Christmas to take photos of the data plates on his Rotary Transformers so I could compare Frame Numbers on his to mine.

Some time back I had wondered about parts for these items, in particular replacement Brushes, so the next time I was inside the Supply Unit I had taken a look at the MG1A and MG2A data plates to get Model Number information from them. There was none, just the CMC Part Numbers 108-605 for the MG1A unit and 108-606 for the MG2A unit. That was puzzling, but there were a new to me set of spaces on the data plates marked FRAME NUMBER, followed by one marked SERIAL NUMBER. My thought at the time was the Frames for given Rotary Transformers might be unique to any given design and just might serve the purpose of a Model Number for parts. With only one set of Rotary Transformers to examine, difficult to prove, so I reached out to Chris for help from his set.

His photos were consistent with my set of Rotary Transformers. Both had the following information:

MG1A:

CMC Part Number 108-605 stamped in yellow below the data plate.

Frame Number stamped in the data plate: "85"

MG2A:

CMC Part Number stamped in yellow 108-606

Frame Number stamped in the data plate: "90"

Just waiting to hear back from a couple of other 52-Set owners about their Robbins & Myers Rotary Transformers, but things look to be headed in the same direction so far. Frame Numbers will be very useful, if and when a supply of NOS Robbins & Myers Rotary Transformer parts ever turns up.


David