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Power - Pentode (NOT beam) ·Pentode

EL156

High-power 50 W output pentode for demanding audio amplifiers and high-output push-pull Class AB stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B5
Base pins: 5
Nominal heater: 6.3 V / 1.9 A

Description

50-watt high-power amplifier pentode for demanding audio power stages, including high-output push-pull class-AB operation.

Socket description

European 5-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B5
Base pins: 5
Nominal heater voltage: 6.3 V
Nominal heater current: 1.9 A
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 25000 Ω
Transconductance: 0.01 S
Max plate voltage: 800 V
Max screen voltage: 450 V
Max plate dissipation: 50 W
Max screen dissipation: 12 W
Max cathode current: 180 mA

Promoted values come from the supplied datasheet; additional ratings, characteristics, and operating points are retained in TUBE_SECTION_PARAMETER.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate cold voltage
1600 V
Screen-grid cold voltage
800 V
Plate voltage
800 V
ClassAB;PushPull;FixedBias
Screen-grid voltage
350 V
ClassAB;PushPull;FixedBias
Control-grid bias
-24 V
ClassAB;PushPull;FixedBias
Plate quiescent current
45 mA
ClassAB;PushPull;PerTube
Plate current at maximum signal
120 mA
ClassAB;PushPull;PerTube
Plate-to-plate load resistance
9500 Ohm
ClassAB;PushPull;TwoTubes
Output power
130 W
ClassAB;PushPull;TwoTubes;Va=800V
Output power
105 W
ClassAB;PushPull;TwoTubes;Va=600V
Output power
80 W
ClassAB;PushPull;CathodeBias;Va=600V