Power Amps
The 211-TII is a directly heated thoriated tungsten cathode triode that can be used as a Class A, Class B, and Class C amplifier.
Heater
Uf----------------------------------------10V
If-------------------------3.25 A
Direct interelectrode capacitance
Input----------------------------------6 PF
Output----------------------------------5.5 PF
Grid to plate ----------------------------------14.5 PF
Static parameters
Ua----------------------------------------1250V
-Ug----------------------------------------70V
Ia-------------------------------------------------100 mA
Gm--------------------------------------3.8 mA/V
u(Ia=75mA)------------------------12
RL----------------------------------------7 K
Pout------------------------------------10 W
Recommended operating conditions (reference values)
Double-barreled A-class (AF):
Typical operating limit parameters
Ua--------750 1000 1250 1250 V
Pa-----------------------------75 W
-Ug-------46 61 80V
Peak voltage——41 56 75 V
Ia(0)-------34 53 60 mA
Li---------4.4 3.8 3.6 K
RL--------8.8 7.6 9.2 K
Pouting------5.6 12 19.7 W
Push-pull, Class B (AF)
Typical operating limit parameters
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(aa)---------------6.9 9 K
Output-----------------200-260W