Description

805A is direct-heated type thorium tungsten cathode triode, can be used as class B, A-F, and R-F power amplification, class C R-F power amplification and high frequency oscillation.
Heater
Uf————————————–10 V
If—————————————3.25 A
Direct Interelectrode Capacitances
input———————————-8.5 PF
output———————————-10.5 PF
grid to plate———————————6.5 PF
Maximum Rating
Ua———————————1500 V
Pa—————————–125 W

Recommended Operating Conditions (reference value)
class B(A-F) for two tubes
typical working condition limited parameter
Ua—————— 1250 1500 1250 V
Ia (mAx.sig per tube)——————- 210 mA
Pa (in) (mAx.sig per tube)————— 315 W
Pa (per t —————————- 125 W
Ug———————————-—16 V
Ug(pk)—————-235 280 V
Ia (0)—————–148 84 mA
Ia（mAx.sig）———-500 600 mA
Pd(mAx.sig)————6 7 W
RL(a—a)—————6.7 8.2 KΩ
Pout(mAx.sig)———–300 370 W
class B(R-F)：
Carrier conditions the biggest modulation coefficient is 1 per tube
typical working condition limited parameter
Ua—————— 1250 1500 1500 V
Ug———————————-—10 V
Ia ——————-135 115 150 mA
Pa (in) ——————————185 W
Pa ———————————125 W
Ug(pk)—————-70 70 V
Ig ——————-15 15 mA
Pd——————-11 7.5 W
Pout——————55 57.5 W