Yamamoto Sound Crafts 7P Tube Socket for 4E27/813

Compatible vacuum tube

4E27, 813 etc.
Mounting holes 55φ Screw spacing 48mm × 4

7P socket for use with 813 and 4E27 transmitter tubes.

The original tube socket is made of fluoroplastic machined from fluoroplastic, and is composed of a round machined pin fixed in place. The tube is securely held in place without rattling, thus preventing sound quality deterioration due to vibration. 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.