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Power - Pentode (NOT beam) ·Pentode-Triode

ECL81

Combination valve incorporating a power-output pentode with diode or triode sections for audio-frequency amplification, detection, or driver service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 600 mA

Description

Universal triode-pentode combination tube for television receivers.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 600 mA
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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0016 S
Amplification factor: 56
Max plate voltage: 250 V
Max plate dissipation: 1.5 W
Max cathode current: 15 mA

Published ratings and characteristics promoted from the approved German source.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 22000 Ω
Transconductance: 0.00875 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 7 W
Max screen dissipation: 1.5 W
Max cathode current: 60 mA

Published ratings and characteristics promoted from the approved German 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

Triode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
600 mA
Nominal
Maximum Plate Voltage
250 V
Maximum Plate Dissipation
1.5 W
Maximum Cathode Current
15 mA

Characteristic

Amplification Factor
20
Typical

SECTION 2

Pentode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
600 mA
Nominal
Maximum Plate Voltage
250 V
Maximum Screen Voltage
250 V
Maximum Plate Dissipation
6.5 W
Maximum Screen Dissipation
1.5 W
Maximum Cathode Current
60 mA

Characteristic

Transconductance
8750 µS
Typical
Plate Resistance
22000 ohm
Typical