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Voltage Radio Detector Converter ·Pentode-Triode

7643

Long-life ruggedized triode-pentode for mixer/RF/AF amplification plus oscillator, multivibrator, and blocking-oscillator service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 330 mA

Description

7643 is a TriodePentode device in the supplied Amperex literature. Long-life ruggedized triode-pentode. The pentode section is intended for mixer, RF, or AF amplification; the triode section is intended for oscillator, multivibrator, or blocking-oscillator service.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
330 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
3600 Ω
Transconductance
0.0062 S
Amplification factor
18
Max plate voltage
275 V
Max plate dissipation
1.75 W
Max grid dissipation
0.1 W
Max cathode current
18 mA

Alias row from E80CF source.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
400000 Ω
Transconductance
0.0062 S
Amplification factor
40
Max plate voltage
275 V
Max screen voltage
225 V
Max plate dissipation
2.15 W
Max screen dissipation
0.8 W
Max grid dissipation
0.1 W
Max cathode current
18 mA

Alias row from E80CF source.

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

1953 AEG

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • TypicalTriodePlateVoltage

    100 V

  • TypicalTriodePlateCurrent

    14.4 mA

SECTION 2

Pentode

Other

  • TypicalPentodePlateVoltage

    170 V

  • TypicalPentodePlateCurrent

    10 mA

  • TypicalPentodeScreenCurrent

    2.8 mA

Data set 02

1953 Amperex

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Transconductance

    6200 µS

  • Amplification Factor

    18

Other

  • Maximum Plate Voltage

    275 V

  • Maximum Plate Dissipation

    1.75 W

  • Maximum Grid Dissipation

    0.1 W

  • Maximum Cathode Current

    18 mA

SECTION 2

Pentode

Characteristic

  • Plate Resistance

    400000 ohm

  • Transconductance

    6200 µS

  • Amplification Factor

    40

Other

  • Maximum Plate Voltage

    275 V

  • Maximum Screen Voltage

    225 V

  • Maximum Plate Dissipation

    2.15 W

  • Maximum Screen Dissipation

    0.8 W

  • Maximum Grid Dissipation

    0.1 W

  • Maximum Cathode Current

    18 mA

Data set 03

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate supply voltage

    100 V

    TriodeSection

  • Plate current

    14 mA

    TriodeSection

  • Cathode resistor

    120 ohm

    TriodeSection

SECTION 2

Pentode

Other

  • Plate supply voltage

    170 V

    PentodeSection

  • Plate current

    10 mA

    PentodeSection

  • Cathode resistor

    155 ohm

    PentodeSection

  • Screen supply voltage

    170 V

    PentodeSection

  • Screen current

    2.8 mA

    PentodeSection

Characteristic

  • Plate resistance

    0.4 MOhm

    PentodeSection

Capacitance

  • Input capacitance

    5.6 pF

    PentodeSection

  • Output capacitance

    3.4 pF

    PentodeSection

  • Grid-to-plate capacitance

    - to 0.025 pF

    PentodeSection; Maximum