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Voltage - Triode (single) ·Triode

264C

General-purpose receiving triode for voltage amplification, detection, oscillator, or Class-A service as documented by the manufacturer.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
MEDIUM4BAYONET
Base pins
4
Nominal heater
1.5 V / 300 mA

Description

Western Electric general-purpose triode with a 1.5 V, 0.3 A oxide-coated filament and a published Class-A operating point.

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
1.5 V
Nominal heater current
300 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
12400 Ω
Transconductance
0.00058 S
Amplification factor
7.2
Max plate voltage
100 V

Electrical characteristics stated identical to 264B except lower microphonics and slightly changed capacitances; representative point 100 V plate, -8 V grid.

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

1956 Western Electric Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Voltage

    1.5 V

  • Heater Current

    300 mA

  • Maximum Plate Voltage

    110 V

  • Plate Voltage

    100 V

    ClassA

  • Plate Current

    2.1 mA

    ClassA

  • Power Output

    0.033 W

    ClassA

Characteristic

  • Amplification Factor

    7.2

    ClassA

  • Transconductance

    580 µS

    ClassA

  • Plate Resistance

    12400 ohm

    ClassA

Data set 02

2026 Western Electric 200s

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

  • Grid To Plate Capacitance

    4.9 pF

  • Grid To Filament Capacitance

    3.2 pF

  • Plate To Filament Capacitance

    2.2 pF

Other

  • Plate Current

    2.1 mA

    PlateVoltage=100V;GridBias=-8V

  • MicrophonicNoiseOutput

    -43 dB re 1V

    PlateVoltage=100V;GridBias=-8V;Load=100kohm

  • EquivalentFluctuationNoiseInput

    -114 dB re 1V

    40to10600Hz;PlateVoltage=100V;GridBias=-8V