Thank you Tim, problem solved. As you said the Sierra multiband CW
transceiver proves the viability of edgecards for plug-in band-
specific subassemblies, the article even points out how simpler the
plug-in implementation is, compared to the switching solutions for the
same problem, citing Wayne Burdick, N6KR's older Safari-4.

After a bit of checking, the current sockets are these:
- Manufacturer: www.sullinscorp.com p.n. EBM25DRXH
- Digi-Key: p.n. S3355-ND

PBT/Phosphor Bronze, Contact Surface: .000010” Gold
Termination: .000100” Pure Tin, Matte
..156” [3.96mm] Contact Centers
50 total contacts, Dual Readout
..200” [5.08mm] Row Spacing; .137”[3.48] Long Dip Solder, straight
Mounting With .125" Hole

Pretty sure I can find similar edgecards & sockets around here.

Thanks again.

Filippo