This bundle includes three JJ ECC803/12AX7 Long Plate Preamp Tubes.A long plate version of the classic 12AX7, the JJ ECC803/12AX7 Long Plate Preamp Tube has higher gain and a creamy, full tone with a spiral filament to reduce microphonics, making this an excellent tube for anyone in need of a 12AX7. And like all JJ tubes, it is durable and high quality. What more could you ask?Brand: JJ ElectronicsModel: ECC803/12AX7Type: Preamp Tube - Long Plate