Preamps
845-TII is a directly heated thoriated tungsten cathode triode, class A1 and AB1
Heater
Uf----------------------------------------10V
If ---------------------------------------- 3.25 A
Maximum Ratings
Ua--------------------------------1250V
Pa------------------------------------------------75 W
Output power (maximum signal)-----------------------------150 W
Ia(max)------------------------------------------120mA;
Direct interelectrode capacitance
Input----------------------------------6 PF
Output----------------------------------4.5 PF
Grid to plate ----------------------------------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 operating conditions (reference values)
A1 level. Single tube:
Voltage source ----- 1000 1000 1250 volts
-Ug--- 145 155 209V
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 type. AB1 category:
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
40 75 75 115 W