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(Ia=75mA)--------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
