• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Chinese loctal sockets

Some years (decades? 😳 ) ago I bought these old Siemens locktal sockets for C3g/C3o/C3m tubes.
IMO these are the best of the ones I've tried.
Locktal socket.jpg