Shuguang 805A hi-end valve electronic tube best matched pair replace 805

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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.

Filament heating
Uf …………………………10 V
If…………………………3.25 A

Interelectrode capacitance
Input capacitance........................8.5 PF
Output capacitance........................10.5 PF
Cross-channel capacitance........................6.5 PF

Limit rating
Anode voltage........................1500 V
Anode dissipated power..................125 W
Operating frequency and anode voltage
When the operating frequency is above 30MC, the anode voltage and anode input power will be reduced according to the following table:
Frequency (MC) anode voltage and anode input power
B pole electrode C-class telephone anode modulation telegraph
30 100% 100%
45 90% 82%
80 71% 55%

Recommended working status (reference value)
Class B A-F power amplification (two tubes) limit value
Ua………………………1250 1500 1500 V
Ia(max.sig.per tube)……………210 mA
Pa(in)(max.sig.per tube) z……315 W
Pa (per tube) ………………………125 W
Ug……………………………………-16 V
üg(pk)…………………235 280 V
Ia(0)……………………148 84 mA
Ia(max.sig)……………500 600 mA
Pd…………………………6 7 W
RL(a-a)……………………6.7 8.2 kΩ
Pout(max.sig)…………300 370 W

Class B R-F power amplification
(The maximum modulation factor of each tube is 1.0 under carrier conditions)
Limit value
Ua………………1250 1500 1500 V
Ug…………………………-10 V
Ia………………135 115 150 mA
Pa(in)……………………………………185 W
üg(pk)…………70 70 V
Ig………………15 15 mA
Pd………………11 7.5 W
Pout……………55 57.5 W

Class C R-F power amplification and oscillation (anode modulation)
(The maximum modulation factor of each tube is 1.0 under carrier conditions)
Limit value
Ua………………1000 1250 1250 V
Ug………………-155 -160 -500 V
Ia………………160 160 175 mA
Ig………………60 60 70 mA
Pa(in)……………………………………220 W
Pa…………………………………………85 W
üg(pk)…………295 300 V
Pd………………16 16 W
Pout……………110 140 W

Class C R-F power amplification and oscillation (anode modulation) (if there is no modulation for each tube under keying conditions)
Ua………………1000 1250 1500 1500 V
Ug………………-95 -100 -105 -500 V
Ia………………200 200 200 210 mA
Ig………………40 40 40 70 mA
Pa(in)………………………………………………315 W


Pa……………………………………………………125 W
üg(pk)…………225 230 235 V
Pd………………8.5 8.5 8.5 W
Pout……………130 170 215 W