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Power - Triode ·Triode

262A

Western Electric power triode for transmitter and amplifier service, intended for substantial signal or power amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
MEDIUM4BAYONET
Base pins
4
Nominal heater
10 V / 320 mA

Description

Power triode for transmitter and amplifier service.

Socket description

Medium 4-contact bayonet base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
MEDIUM4BAYONET
Base pins
4
Nominal heater voltage
10 V
Nominal heater current
320 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

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
15400 Ω
Transconductance
0.00098 S
Amplification factor
15.1
Max plate voltage
180 V

Representative recommended point: 135 V plate, -4.5 V grid, 2.8 mA; source marks operating points up to 180 V as maximum.

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

1933 Western Electric Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate-cathode capacitance

    1.9 pF

    Published direct interelectrode capacitance

  • Grid-cathode capacitance

    0 pF

    Published direct interelectrode capacitance

Data set 02

2026 Western Electric 200s

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Grid To Plate Capacitance

    1.9 pF

  • Grid To Cathode And Heater Capacitance

    1.8 pF

  • Plate To Cathode And Heater Capacitance

    4 pF

Other

  • Maximum Heater Cathode Voltage

    90 V

  • Plate Current

    2.8 mA

    PlateVoltage=135V;GridBias=-4.5V

  • HumOutputLevel

    -110 dB re 1mA

    PlateVoltage=135V;GridBias=-4.5V;Load=15kohm;SupplyFrequency

  • MicrophonicNoiseOutput

    -54 dB re 1V

    PlateVoltage=185V;GridBias=-4.5V;Load=100kohm