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Voltage Pentode - Sharp Cutoff (single) ·Pentode

PF86

Fixed-slope pentode designed for transitron circuits and low-level voltage amplification. Manufacturer data also identify low-noise amplifier service, making it suitable for sensitive signal and specialized oscillator/reactance circuits.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
4.5 V / 300 mA

Description

Fixed-slope pentode for transitron circuits and low-level voltage amplification.

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
4.5 V
Nominal heater current
300 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

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
2500000 Ω
Transconductance
0.002 S
Max plate voltage
250 V
Max screen voltage
200 V
Max plate dissipation
1 W
Max screen dissipation
0.2 W
Max cathode current
4 mA

Published values promoted where clearly readable; identical repeated sections compressed when applicable.

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

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater voltage

    4.5 V

    Published nominal value or midpoint of published range

  • Heater current

    300 mA

    Published nominal value or midpoint of published range

Capacitance

  • Input capacitance

    3.5 pF

    Published first-page value

  • Output capacitance

    5 pF

    Published first-page value

Data set 02

1963 Philips Electron Tubes Handbook V1

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    250 V

    LowNoiseAmplifier

  • Screen voltage

    140 V

    LowNoiseAmplifier

  • Control-grid voltage

    -2 V

    LowNoiseAmplifier

  • Plate current

    3 mA

    LowNoiseAmplifier

  • Screen current

    0.6 mA

    LowNoiseAmplifier

  • Application

    Low-level AF/RF amplification in 300 mA series chains

    Section1

Characteristic

  • Transconductance

    2000 µS

    Section1

  • Plate resistance

    2.5 MΩ

    Section1

  • Amplification factor

    38

    Section1

Data set 03

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • HeaterVoltageNominal

    4.55 V

    Nominal

  • HeaterCurrentNominal

    300 mA

    Nominal

  • Maximum Plate Voltage

    300 V

  • Maximum Screen Voltage

    200 V

  • Maximum Plate Dissipation

    1 W

  • Maximum Screen Dissipation

    0.2 W

  • Maximum Cathode Current

    4 mA

Characteristic

  • Transconductance

    2200 µS

    Typical

  • Plate Resistance

    2500000 ohm

    Typical

Data set 04

1972 Philips Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

  • Heater voltage

    4.5 V

    Published nominal value

  • Heater current

    300 mA

    Published nominal value

  • Transconductance

    2200 µS

    Published operating characteristic

Other

  • Application

    Transitron circuits

    Printed source application

Data set 05

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Anode capacitance

    5 pF

  • Grid capacitance

    3.5 pF

Other

  • Anode-grid capacitance

    0.05 pF