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211 is direct-heated type thorium tungsten cathode triode, can be used as class A, B and C.

Heater
Uf--------------------------------------10 V
If---------------------------------------3.25 A

Direct Interelectrode Capacitances
input----------------------------------6 PF
output----------------------------------5.5 PF
grid to plate----------------------------------14.5 PF

Static parameter

Ua--------------------------------------1250 V
—Ug------------------------------------70 V
Ia--------------------------------------100 mA
Gm-------------------------------------3.8 mA/V
u(当Ia=75mA时)---------------------------12
RL--------------------------------------7 KΩ
Pout------------------------------------10 W

Recommended Operating Conditions ( reference value)

class A(A-F) for two tubes：
typical working condition     limited parameter

Ua--------750 1000 1250 1250 V
Pa----------------------------75 W
—Ug-------46 61 80 V
Ug(pk)-----41 56 75 V

Ia(0)-------34 53 60 mA
ri---------4.4 3.8 3.6 KΩ
RL--------8.8 7.6 9.2 KΩ
Pout-------5.6 12 19.7 W

Push-pull. class B(A-F)

typical working condition     limited parameter

Ua------------------ 1000 1250 1250 V
Ia (mAx.sig per tube)-------------------175 mA
Pa (in) (mAx.sig per tube)--------------- 220 W
Pa (per tube)------------------------- 100 W
—Ug------------------72 95 V
Ug(pk)-----------------380 410 V
Ia (0)------------------20 20 mA
Ia（mAx.sig）-----------320 320 mA
Pd(mAx.sig)------------7.5 8 W
RL(a—a)---------------6.9 9 KΩ
Pout------------------200 260 W