4P Tube Socket for GM-70

Compatible Tubes

GM-70 etc.
Mounting holes 55φ Screw spacing 48mm × 4
*H" in the dimensional drawing is 25mm.

This is a socket for the large Russian 3-pole output tube GM-70.

*Please contact us if you wish to use 7-pin type vacuum tubes.

The original tube socket is made of fluoroplastic machined from fluoroplastic with round machined pins fixed to it. This prevents deterioration of sound quality due to vibration because the vacuum tube is held firmly without rattling. The fluoroplastic also has excellent insulation properties, making it a key component in the construction of vacuum tube amplifiers.

Explanation of materials used

Fluoroplastic: Official name is ethylene tetrafluoride, which has the highest electrical insulation and dielectric constant of any solid. It also has excellent temperature resistance characteristics.

Phosphor bronze: Used as the material for the pins of most tube sockets (except L series). It has high strength, excellent springiness, and maintains stable contact.

Gold plating: Thick gold plating is applied to most socket pins over a non-magnetic base material. (Except for the L series) Magnetic materials are also eliminated from the plating as much as possible.