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Unknown Type 547 add-on circuit.


snapdiode
 

I think the bigger story here is a 10$ 547.


Martin Hodge
 

Can anyone identify the circuit shown in the photo album? It's in a Type 547 I got off craigslist for $10.

https://groups.io/g/TekScopes/album?id=250335

It's only connections are a 4 pin xlr socket mounted thru a hole in the left cowling and 4 leads that clip directly to the CRT deflection plates. Apparently some kind of interface, but for what?