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Power - Pentode (NOT beam) ·Pentode

EL12SP

Power/output pentode designed for audio-frequency power amplification in single-ended or push-pull output stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: Y8A
Base pins: 8
Nominal heater: 6.3 V / 1.2 A

Description

Special EL12 power pentode selected for high-output push-pull class-AB audio operation.

Socket description

Steel-tube 8-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: Y8A
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 1.2 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: 50000 Ω
Transconductance: 0.01 S
Max plate voltage: 425 V
Max screen voltage: 425 V
Max plate dissipation: 18 W
Max screen dissipation: 2.5 W
Max cathode current: 120 mA

Published ratings and characteristics promoted from the approved source.

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

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage, two-tube push-pull AB
425 V
ClassAB;PushPull;TwoTubes
Screen-grid voltage
425 V
ClassAB;PushPull;TwoTubes
Plate current
84 mA
ClassAB;PushPull;TwoTubes
Screen-grid current
10 mA
ClassAB;PushPull;TwoTubes
Load resistance plate-to-plate
5 kΩ
PushPull
Cold plate voltage maximum
650 V
Cold screen-grid voltage maximum
650 V

Characteristic

Audio output power
43 W
PushPull
Distortion
6.5 %
At43WOutput

Capacitance

Input capacitance
17.5 pF
Output capacitance
7 pF
Grid-to-plate capacitance
<0.7 pF

Data set 02

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
425 V
ClassAB;PushPull;TwoTubes
Screen-grid voltage
425 V
ClassAB;PushPull;TwoTubes
Plate quiescent current
30 mA
ClassAB;PushPull;PerTube
Screen-grid quiescent current
5 mA
ClassAB;PushPull;PerTube
Cathode resistor
325 Ohm
ClassAB;PushPull;PerTube
Plate-to-plate load resistance
6000 Ohm
ClassAB;PushPull;TwoTubes
Output power
45 W
ClassAB;PushPull;TwoTubes
Plate cold voltage
650 V
Screen-grid cold voltage
650 V

Capacitance

Grid-to-plate capacitance maximum
0.7 pF