Cary Bakelite Vacuum Tube Saver Socket Testing 1pc 9pin Fr 12ax7 + 1pc 8pin Octal DIY Condition: New Quantity: 4 pieces For 8pins tube: KT88 6550 EL34 6SN7... and for 9pin tube: 12AX7B 12AU7B... Useful Life: 200 times