5PCS Ceramic 9Pin B9A PCB MOUNT Tube Socket. It is for 12AX7,12AT7,12AU7,ECC83,ECC82,E88CC 6922 6p1 6p14 6n1 6N2 6N3 6n11;. for 12AX7,12AT7,12AU7,ECC83,ECC82,E88CC 6922 6p1 6p14 6n1 6N2 6N3 6n11;. Option Type:Copper-Plated Tube Socket,Tin-Plated Tube Socket;.