Heater
Uf-----------------------------6.3 V
If----------------------------------0.76 A

Direct Interelectrode Capacitances

input--------------------------10.8 PF
output-----------------------------6.5 PF
grid to plate----------------------0.5 PF
grid to filament----------------0.25 PF

 Static parameter

Ua-----------------------------------256 V
Ug2----------------------------------256 V
Rk-----------------------------------120 Ω
Ia------------------------------------48 mA
Ig2-----------------------------------7 mA
Gm-----------------------------------≥9 mA/V
ug1-g2-------------------------------19
ri------------------------------------38 KΩ

Maximum Rating
Ua------------500 V
Pa--------------------12 W
Ug2------------------300 V
Pg2-------------------2 W
Ik-------------------------65 mA
Ug1----------------------—100 V
Uh-k(pk)-----------------±100 V
Rg1
with cathode bias------------------------1 MΩ
with fixed bias-----------------------0.3 MΩ

Recommended Operating Conditions（reference value）

class A1.single tube.
Ua------------------------250 V
Ug2----------------------------250 V
Ug1----------------------------—7.3 V
Rk-----------------------------135 Ω
RL-----------------------------5.2 KΩ
Ug1(r.M.S)----------0 3.4 4.3 4.7 V
Ia(0)---------------48 — — — mA
Ia(mAx.sig)----------— — 49.5 49.2 mA
Ig2(0)--------------5.5 — — — mA
Ig2(mAx.sig)----- ---— — 10.8 11.6 mA
Gm----------------11.3 — — — mA/V
ri------------------38 — — — KΩ
ug1-g2-------------19 — — —
Pout---------------0 4.5 5.7 6.0 W