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EL34B(with shadow grid) is a high performance improved version of pentode EL34A to solve the problem of overheated No. 2 Grid. Maximum anode dissipation is 25W and output power of single tube is over 10W in A1 amplification mode. When used in AB1 mode, two tubes can output over 35W. It can substitute 6CA7. |
Technical specification
Heater:
Uh……………………………6.3 V
Ih……………………………1.5 A
limit rating
plate voltage……………………… 800 V
second grid voltage………………… 500 V
first grid voltage………………… -100 V
plate dissipation power………………… 25 W
second grid dissipation power…………… 8 W
cathode current………………………150 mA
first grid resistance
when it is self-partial voltage…………0.7 MΩ
when it is fixup partial voltag…………0.5 MΩ
heatervoltage between cathodes…………±100 V
temperature of glass crust………………250 ℃
capacitance between poles
input capacitance…………………… 15.2 PF
output capacitance…………………… 8.4 PF
transroute capacitance…………………… 1.1 PF
first grid heater capacitance……… 1.0 PF
heater shade capacitance between poles… 10 PF
Ua…………………………… 250 V
Ug2……………………………250 V
Ug3…………………………… 0 V
-Ug1…………………………12.2 V
Ia…………………………… 100 mA
Gm…………………………… 11 mA/V
ri…………………………… 15 kΩ
μg1-g2………………………11