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Voltage - Triode (single) ·Triode

6286

Directly heated subminiature triode for radio-frequency oscillator service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
SUBMINIATURE8
Base pins
4
Nominal heater
1.25 V / 125 mA

Description

Directly heated subminiature triode for radio-frequency oscillator service.

Socket description

Subminiature 8-lead base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
SUBMINIATURE8
Base pins
4
Nominal heater voltage
1.25 V
Nominal heater current
125 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
5500 Ω
Transconductance
0.0021 S
Amplification factor
15
Max plate voltage
100 V
Max plate dissipation
0.45 W
Max cathode current
7 mA

Published electrical limits and characteristics promoted from the approved source; identical repeated sections compressed where applicable.

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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Heater or filament voltage

    1.25 V

    Published nominal or representative value

  • Heater or filament current

    40 mA

    Published nominal or representative value

  • Transconductance

    1100 µS

    Published operating characteristic

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage

    1.25 V

    Nominal

  • Heater current

    125 mA

    Nominal

  • Plate voltage

    100 V

    Published operating table; OperatingPoint1

  • Plate voltage

    67.5 V

    Published operating table; OperatingPoint1

  • Plate voltage

    67.5 V

    Published operating table; OperatingPoint1

Characteristic

  • Plate current

    7 mA

    Published operating table; OperatingPoint1

  • Plate current

    6 mA

    Published operating table; OperatingPoint1

  • Plate current

    5.25 mA

    Published operating table; OperatingPoint1

  • Transconductance

    2100 uS

    Published operating table; OperatingPoint1

Data set 03

1966 Tung Sol Electronic Tubes 4 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater/filament voltage

    1.25 V

  • Heater/filament current

    125 mA

Application

  • Application summary

    Directly heated subminiature military triode.

Characteristic

  • Plate voltage

    67.5 V

  • Plate current

    5 mA

  • Transconductance

    1500 uS

  • Maximum plate voltage

    100 V

  • Grid-to-filament capacitance

    1.3 pF

Data set 04

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • HeaterVoltageNominal

    1.25 V

    Nominal

  • HeaterCurrentNominal

    120 mA

    Nominal

  • Maximum Plate Voltage

    100 V

  • Maximum Plate Dissipation

    0.45 W

Characteristic

  • Transconductance

    2100 µS

    Typical

  • Amplification Factor

    11.5

    Typical

  • Plate Resistance

    5500 ohm

    Typical