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Voltage Tetrode ·Tetrode

2EA5

Sharp-cutoff screen-grid tetrode intended primarily for RF voltage amplification, providing high gain with comparatively abrupt cutoff characteristics.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B7G
Base pins
7
Nominal heater
2.4 V / 600 mA

Description

Series-heater tetrode for high-voltage RF amplifier service.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B7G
Base pins
7
Nominal heater voltage
2.4 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

1 physical section, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances
Plate resistance
150000 Ω
Transconductance
0.008 S
Max plate voltage
250 V
Max screen voltage
150 V
Max plate dissipation
3.25 W
Max screen dissipation
0.5 W
Max cathode current
20 mA

Series-heater tetrode for high-voltage RF amplifier service.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Capacitance

  • Grid To Plate Capacitance

    0.05 pF

    WithShield

  • Input Capacitance

    4.5 pF

    WithShield

  • Output Capacitance

    3 pF

    WithShield

Other

  • Plate Voltage

    250 V

  • Screen Voltage

    140 V

Characteristic

  • Plate Current

    10 mA

Data set 02

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Capacitance

  • GRID TO PLATE (G

    0.06 ΜΜF

    Capacitances | GRID TO PLATE (G1 TO P) (MAX.) 0.05 0.06 µµf

Other

  • HEATER VOLTAGE

    2.4 V

    Maximum Ratings | HEATER VOLTAGE 2.4 2.4 2.4 VOLTS

  • MAXIMUM PLATE DISSIPATION j

    3.25 W

    Maximum Ratings | MAXIMUM PLATE DISSIPATION j.29 3.25 3.25 WATTS

  • MAXIMUM GRID #

    5 W

    Maximum Ratings | MAXIMUM GRID #2 DISSIPATION O.5 O.5 O.5 WATTS

  • HEATER WARM- UP TIME (APPROX.)'

    11 s

    Maximum Ratings | HEATER WARM- UP TIME (APPROX.)' 11.0 11.0 11.0 SECONDS

  • HEATER VOLTAGE

    2.4 V

    Typical Operating Conditions | HEATER VOLTAGE 2.4 2.4. 2.4 VOLTS

  • GRID #

    140 V

    Typical Operating Conditions | GRID #2 VOLTAGE 140 140 140 VOLTS

  • GRID #

    0.95 mA

    Typical Operating Conditions | GRID #2 CURRENT 0.95 0.95 0.95 MA.