ITEM NAME:9pin PCB mounting Vacuum tube socket GZC9-A-G for 12AX7 /12AU7/ 12AT7 Description: It's a 9-pin tube socket GZC9-A-G PCB for 12AX7 / 12AU7 / 12AT7. Made of ceramic and gold-plated,more durable. It's vintage electronic socket for audio testing. Package Includes: 1 Piece 9 Pin Vacuum Tube Sockets.It's a 9-pin tube socket GZC9-A-G PCB for 12AX7 / 12AU7 / 12AT7. 1 Piece 9 Pin Vacuum Tube Sockets.