2AF4A

Miniature UHF triode for television-tuner oscillator and amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: E7-1
Socket code: B7G
Base pins: 7
Nominal heater: 2.35 V / 600 mA

Description

Miniature UHF triode (2AF4A) for television tuner oscillator and 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: E7-1
Socket code: B7G
Base pins: 7
Nominal heater voltage: 2.35 V
Nominal heater current: 600 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: 14
Max plate voltage: 150 V
Max plate dissipation: 2.5 W
Max cathode current: 24 mA
Rectifier peak inverse voltage: 0.022 V

Reference/heater-variant sheet; no unprinted electrical ratings were imported from the referenced 6-series datasheet.

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

Other

Heater Warmup Time
11 s
Plate Voltage
80 V
ClassA

Capacitance

Grid To Plate Capacitance
1.3 pF

Data set 02

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater Voltage
2.35 V
Heater Current
600 mA

Other

Maximum Plate Voltage
150 V
UHF Oscillator
Typical Plate Supply Voltage
100 V
UHF Oscillator; 1000MHz
Typical Operating Frequency
1000 MHz
UHF Oscillator
Maximum Heater-Cathode Voltage
50 V
TotalDCPlusPeak

Data set 03

1966 Tung Sol Electronic Tubes 1 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
150 V
UHFOscillator
Plate current
20 mA
UHFOscillator
Application
UHF television oscillator/amplifier
Section1

Characteristic

Plate resistance
2100 Ω
Section1
Transconductance
6500 µS
Section1
Amplification factor
14
Section1