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3EA5

Sharp-cutoff tetrode for high-plate-voltage RF amplification in VHF television tuners. Its high output resistance and controlled cutoff suit low-level tuner front ends.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B7G
Base pins: 7
Nominal heater: 2.9 V / 450 mA

Description

Sharp-cutoff tetrode for high-plate-voltage RF amplification in VHF television tuners.

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: 2.9 V
Nominal heater current: 450 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

Tung-Sol 3EA5 sharp-cutoff seven-pin miniature tetrode for high-plate-voltage RF amplifier service in VHF television tuners, heater 2.9 V at 0.45 A. Manufacturer maximum plate 250 V, screen 150 V, plate dissipation 3.25 W, screen dissipation 0.5 W, cathode DC current 20 mA. Typical at Va 250 V, screen 140 V, control grid about -1 V: gm 8000 µmhos (0.008 S), plate resistance approximately 0.15 MΩ (150 kΩ), plate current 10 mA. Controlled warm-up approximately 11 s under manufacturer warm-up test. Heater-cathode total DC/peak max 200 V, positive DC heater 100 V. Direct interelectrode capacitances documented.

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

Other

MAX IMUM PLATE VOLTAGE 250 250
250 VOLTS
Published datasheet value
MAX IMUM CATHODE CURRENT (DC) 20 20
20 MA
Published datasheet value
PLATE VOLTAGE 250 250
250 VOLTS
Published datasheet value
PLATE CURRENT 10 10
10 MA
Published datasheet value
GRID #2 CURRENT 0.35 0.95
0.95 MA
Published datasheet value

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 capacitance maximum with shield
0.05 pF
Section1
Input capacitance with shield
4.5 pF
Section1
Output capacitance with shield
3 pF
Section1
Grid-to-plate capacitance maximum unshielded
0.06 pF
Section1
Input capacitance unshielded
3.8 pF
Section1
Output capacitance unshielded
2.3 pF
Section1

Other

Plate voltage maximum
250 V
VHFRFAmplifier
Screen voltage maximum
150 V
VHFRFAmplifier
Plate dissipation maximum
3.25 W
Section1
Cathode current maximum
20 mA
Section1
Application
High-plate-voltage VHF tuner RF amplifier
Section1