Electronic tube base: as a connector connecting PCB circuit board and electronic tube,tube amplifier, 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. Pack of 4 Tube Socket; Suitable for KT66 KT88 6SL7 6SN7 6V6 5AR4/GZ34 5R4GY 5U4G 6AS7G 6B4G 6BL7GT 6F6 6J5 6J7 6L6 6SJ7 274B 348A 350B 421A 5691 etc. tube. The valve tube socket is made of bakelite socket and tough thick gold plating pin. and not easy to rust.<br><br>Model:GZC9-F-3-G Terminal:9 pins Size:27x10.5x17mm/1.06x0.41x0.67 Inch(W x H x total H) Outside diameter:35mm/1.38 Inch Installation hole spacing:28mm/1.1 inch Panel opening diameter:20mm/0.79 Inch Colour:White-Gold Material:PCB<br><br>Package Contents: 4 * Tube Socket<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.