Condition: New Quantity: 4 pieces For 9pins tube: 12AX7, 12AU7... Working Voltage:1500V Contact Resistance >0.01Ω Insulation Resistance <10000MΩ Useful Life: 200 times Package includes: 1x 4PCS 9 PIN PCB VACCUM TUBE SOCKET SAVER FOR SHUGUANG 12AX7 12AU7 AUDIO tube amp