Power output pentode EL156A is glass crust eight GT, its anti-cathode limits power dissipation of 50W. For output stage amplification, it is used as class A and AB amplifier.
Specification
Filament voltage
UH …………………………6.3 V
IH…………………………1.9 A
Maximum rating
anode voltage……………………800 V
second grid voltage………………450 V
anode dissipation power………………50 W
second grid dissipation power…………8 W
cathode current……………………180 mA
voltage between heating and cathode
preset bias time……………………0.1 M?
self-bias time………………………0.1 M?
Capacitances
input capacitance……………………19 PF
output capacitance……………………7.5 PF
transconductance capacitances……………………0.5 PF
capacitance between grid No.1 and heater……0.25 PF
Static state parameters
Ua…………………………440 V
Ug2…………………………350 V
Rk…………………………150 ohm
Ia……………………………100 mA
Ig2…………………………16 mA
Gm…………………………11 mA/V
?g1-g2……………………6.2
Recommended operating condition(suggested value)
Single-tube class A amplification
Ua(0)……………………300 450 V
Ug2………………………250 250 V
Rk…………………………60 90 ?
Ia(0)……………………120 112 mA
Ia(max.sig)……………116 108 mA
Ig2………………………15 17 mA
Ig2(max.sig) …………24 27 mA
RL…………………………4 3.8 k?
üg1………………………6 9.2 V
Pout……………………15 25 W
Dtot……………………8 9 %
Push pull AB1 amplification(preset bias)
Ua(b)……………………600 600 V
Ug2………………………300 350 V
Rk………………………160 200 ohm
Ia(0)……………………80 80 mA
Ia(max.sig)……………95 100 mA
Ig2 ……………………10 10.5 mA
Ig2(max.sig) …………18 20 mA
üg1………………………13.5 18.5 V
RL(a-a)……………………8.5 7.6 kohm
Pout………………………65 80 W
Dtot………………………4 4 %