I am looking for one (or more) crystal sockets (preferably ceramic)
for the FT-171-B crystal and/or the DC-34 (or DC-35).

I am aware that the FT-171-B will fit into standard banana jacks. I
am also aware that many amateur radio operators used vacuum tube
sockets, but I am looking for a crystal socket.

For example, the Hallicrafters/Signal Corps BC-610 tuning unit has a
crystal socket for the FT-171-B. I am not certain what type of DC-34
crystal socket was used in the BC-669.

Also of interest is a ceramic (or possibly, plastic) 3-terminal socket
for the FT-249. These were used primarily in crystal impedance meters
of the time such as the latter versions of the TS-330/TSM.

I am a crystal historian who is constructing a test fixture for
measuring the electrical parameters for many types of crystals. I
have a few hundred crystals to measure and I want to avoid using
adapters whenever possible.

Ken Burch
WB9TRY