1PC PSVANE 5U4G Rectifier Vacuum Tube for 274B 5Z3P Tubes Pre-amplifier The anode voltage supply ...... 2500V Loaded impedance..........2000 Each arm impedance..........75 Filter capacitor.........4F Package Included: 1 * 1PC PSVANE 5U4G Rectifier Vacuum Tube for 274B 5Z3P Tubes Pre-amplifier