Not sure but Google suggested:  A 5-pin tube socket can be referred to by several names, including UY5, UX5, B5, and U5A. The "B5" name often refers to a specific pin layout, sometimes called a "kite" or "kite base,"

OK smart people, what is the proper name of this type old socket? It’s a five pin socket that would have been used on a battery pack. Building up a couple battery packs for MAB radios and need more of these. Also similar to what’s used on the battery pack on the BC-474 radios (receiver) except that’s a four pin missing the one loan top pin.

 

Ray F/KA3EKH

 

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