[ARC5] Any difference in the front plugin pin out on CCT-46104

[J Mcvey]

I thought these were close to, or maybe the same as the SCR-274 system?I have no info on these. Is this an ARA designation?
The reason i ask is the original owner had a volume control, BFO switch and another switch ( not power).There were pencil notes inside the cavity labeling the pins for "BFO" and "AVC".Is this original or something the guy modified?
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