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Voltage - Triode (single high frequency) ·Triode

3AF4A

UHF television-service triode for amplifier and oscillator applications in television tuner circuits.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
E7-1
Socket code
B7G
Base pins
7
Nominal heater
3.2 V / 450 mA

Description

UHF television-service triode for amplifier and oscillator applications. The supplied sheet explicitly prints 3AF4A with 3AF4.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
E7-1
Socket code
B7G
Base pins
7
Nominal heater voltage
3.2 V
Nominal heater current
450 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

E7-1 - 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
2100 Ω
Transconductance
0.0065 S
Amplification factor
13.5
Max plate voltage
150 V
Max plate dissipation
2.5 W
Max cathode current
25 mA
Rectifier peak inverse voltage
0.022 V
Rectifier max heater-cathode voltage
50 V

Only heater data printed; source refers to 6AF4-A.

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

Triode

Capacitance

  • Grid to plate capacitance

    1.9 pF

  • Grid to cathode and heater capacitance

    2.2 pF

Other

  • Plate voltage

    150 V

    UHFOscillator

  • Plate dissipation

    2.5 W

    UHFOscillator

  • Plate voltage

    80 V

    UHFOscillator

Characteristic

  • Transconductance

    6500 uS

    UHFOscillator

  • Amplification factor

    13.5

    UHFOscillator

  • Plate resistance

    2100 ohm

    UHFOscillator

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater Voltage

    3.2 V

  • Heater Current

    450 mA

  • ControlledWarmupHeater

    1 boolean

  • Heater Warmup Time

    11 s

  • Grid To Plate Capacitance

    1.5 pF

  • Input Capacitance

    2 pF

  • Output Capacitance

    1 pF

  • MaximumOperatingFrequency

    500 MHz

    UHF oscillator

  • Application

    UHF local oscillator

Other

  • Plate Voltage Maximum

    150 V

  • GridVoltageMaximum

    -50 V

    Negative

  • GridCurrentMaximum

    5 mA

  • Plate Dissipation Maximum

    2.5 W

  • Cathode Current Maximum

    25 mA

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Heater voltage

    3.15 V

    Published heater rating

  • Heater current

    600 mA

    Published heater rating

Other

  • Maximum plate voltage

    150 V

    UHFOscillator

  • Maximum plate dissipation

    2.5 W

    UHFOscillator

  • Maximum grid current

    2 mA

    UHFOscillator

  • Maximum cathode current

    24 mA

    UHFOscillator

Data set 04

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • HeaterOrFilamentVoltageNominal

    3.2 V

  • HeaterOrFilamentCurrentNominal

    450 mA

  • Maximum Plate Voltage

    150 V

  • Maximum Plate Dissipation

    2.5 W

  • Maximum Peak Inverse Voltage

    0.022 V

Characteristic

  • Plate Resistance

    2100 Ohm

  • Transconductance

    6500 uS

  • Amplification Factor

    13.5

Data set 05

1971 RCA HB3 Binder 4 of 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Current — published value 1

    450 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Current — published value 2

    30 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Voltage (AC or DC) at heater — published value 1

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Voltage (AC or DC) at heater — published value 2

    0

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Current — published value 1

    0 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Current — published value 2

    600 A

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.

  • Current — published value 3

    40 mA

    Published datasheet value; multiple numbers on a row represent separate source limits or conditions.