W0VT's post reminds me I picked up in the distant past, a apparently rare TR switch that I can find nothing on. Maybe someone on the list has some knowledge or data on it.

It has no case, labeled: Lynmar Engineering, Philadelphia. The chassis box is quite small with one side open. The label says it is a "TRS-2 trans-receive switch". It uses 2 miniature tubes (one is an OA2 regulator and one is missing).

My guess it comes from the late 40's or early 50's.

Sure would like to track down a schematic for it.  Bama doesn't list it.

Your attention is appreciated.

Ray, W4BYG


-- I'm no longer young enough to know everything!
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