Description

2PCS Psvane HIFI 845 Vacuum Valve Electron Tube Amplifier AMP DIY Matched Pair Warranty 12 months! 845 is direct-heated type thorium tungsten cathode triode, class A1 and AB1 Heater Uf---------------------------------------10 V If----------------------------------------3.25 A Maximum Rating Ua----------------------------------1250 V Pa-------------------------------75 W Pout(max.sig)--------------------------150 W Ia(max)------------------------------120 mA; Direct Interelectrode Capacitances input----------------------------------6 PF output----------------------------------4.5 PF grid to plate----------------------------------14.5 PF Static parameter Ua--------------------------------------1250 V —Ug-------------------------------------200 V Ia---------------------------------------80 mA Gm--------------------------------------3 mA/V ri----------------------------------------1.7 KΩ u----------------------------------------5 RL---------------------------------------3.4 KΩ Ug(pk)------------------------------------69 V Pout-------------------------------------15 W Recommended Operating Conditions（reference value class A1 .single tube ： Ua-----1000 1000 1250 V —Ug--- 145 155 209 V RL-----6 9 16 KΩ Ia------90 65 52 mA Gm-----3.1 — — mA/V Ug(pk)--— 110 148 V ri------1.7 1.9 2.1 KΩ Pout----24 21 24 W Push-pull.class AB1 ： Ua------------------ 800 1000 1000 1250 V —Ug---------------- 125 170 175 225 V RL------------------ 4.5 4.6 4.6 6.6 KΩ Ia--------------------80 70 40 40 mA Ug(pk)----------------177 240 — — V Ia（mAx.sig）---------170 230 230 240 mA Pout----------------40 75 75 115 W