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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
