811(FU-811)
Straight heating thorium-tungsten cathode high μ Tube tridoes 811 is used to amplify the power in high frequency surge power. 811 is the same with 811A, and can exchange each other.
Filament heating
UF: 6.3 V
If: 4 A
Limit rating
Plate voltage: 1250 V
Anticathodecurrent: 125 mA
Plate dissipation power: 40 W
Gridcurrent: 50 mA
Working frequency and plate voltage
When working frequency is higher than 30MC, its anticathode working voltage and anticathode input power will adjust according to the below table:
Working frequency (MC) plate voltage and anticathode input power
60 89%
80 70%
100 55%
When working continuously, anticathode can not be allowed to be little red. When it is not working, anticathode is just a little red.
Capacitance between poles
Input capacitance: 5.5 PF
Output capacitance: 0.6 PF
Transroute capacitance: 5.5 PF
Static state parameter:
Ua: 2000 V
-Ug: 2 V
Ia: 26 mA
Μ (Ia=20 mA) 160 mA
A- F power amplify or adjust
B series amplify, grid prompting
Limit rating
CCS ICAS
Ua: 1250 1500 V
Ia(max. Sig): 175 175 mA
PA: 45 65 W
PA(in)(max. Sig) 165 235 W
Commend working state(reference value)
(value of two tubes)
CCS ICAS
Ua: 1250 1500 V
Ug: 0 -4.5 V
Ia(0): 50 32 mA
Ia(max. Sig): 260 313 mA
Pd(max. Sig) 3.8 4.4 W
RL(a-a): 12.4 12.4 kΩ
Pout(max. Sig)235 340 W
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