Preamps
WE845 is a directly heated thoriated tungsten cathode triode for class A1 and AB1 power amplification.
Filament Heating
Voltage ----------------------------------------10V
If ---------------------------------------- 3.25 A
Restrict Rating
Anode voltage----------------------------------1250V
Anode power dissipation -----------------------------75 W
Output power at maximum signal-----------------------------150 W
Maximum anode current---------------------------------120 mA;
Interelectrode capacitance
Input capacitance---------------------------------6PF
Output Capacitor ---------------------------------4.5 PF
Inter-circuit capacitance ----------------------------------14.5 PF
Static parameters
Ua----------------------------------------1250V
-Ug------------------------------------------------ -200V
Ia------------------------------------------------80 mA
Gm--------------------------------------3 mA/V
Li----------------------------------------------------1.7 K
You----------------------------------------------------------------5
RL---------------------------------------------3.4 K
Ug(pk)--------------------------------69 V
Pout----------------------------------------------------15 W
Recommended working status (reference value)
Single tube class A1 amplifier.
Voltage source ----- 1000 1000 1250 volts
--- Voltage --- 145 155 209 V
RL-----6 9 16 K
Current value------90 65 52 mA
Transconductance -----3.1 - - mA/V
Peak voltage --- 110 148 V
Li------1.7 1.9 2.1 thousand
Pout----24 21 24 W
Push-pull class AB1 amplifier.
Ua----------------- 800 1000 1000 1250 V
-Ug---------------- 125 170 175 225 volts
Hysteresis------------------ 4.5 4.6 4.6 6.6 Open
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