Uxcell 7pin Tube Socket Ceramics for Vacuum Tube Tinning plate for E2d C3b Tube

What is this? Electronic tube base: as a connector connecting PCB circuit board and electronic tube it is mainly used for spare parts of audio vacuum electronic tube. These parts are used with electronic tubes in audio equipment to improve the sound quality. Is there any advantages of the product? Made of Ceramics socket and tough thick Tinning plate pin. Durable and not easy to rust. How to use it? 1. Connect the hole of the base with the pin of the electronic tube. 2. Weld the foot on the PCB board. What should I notice? Please confirm the model and the size before you buy.