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Voltage Radio Detector Converter ·Pentode-Triode

9F8P

Triode-pentode for heterodyne oscillator, frequency-converter, and television pulse-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
B9A
Base pins
9
Nominal heater
9 V / 300 mA

Description

The 9F8P is a triode-pentode for heterodyne oscillator, frequency-converter, and television pulse-amplifier 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
9 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Transconductance
0.005 S
Amplification factor
20
Max plate voltage
250 V

Full electrical-data audit completed for this tube.

Section 2

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
400000 Ω
Transconductance
0.0062 S
Max plate voltage
250 V
Max screen voltage
170 V
Max plate dissipation
2.5 W
Max screen dissipation
0.7 W

Pentode section values from English specification table.

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 Russian

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater voltage

    8.1 to 9.9 V

    Series-heater television service

Characteristics

  • Heater current

    280 to 320 mA

    Published nominal tolerance

  • Triode anode voltage

    100 V

    Published operating point

  • Triode grid voltage

    -2 V

    Published operating point

  • Triode anode current

    8 to 18 mA

    Published tolerance

  • Triode transconductance

    3.5 to 6.5 mA/V

    Published tolerance

  • Triode amplification factor

    20

    Published value

  • Pentode anode voltage

    170 V

    Published operating point

  • Pentode screen voltage

    170 V

    Published operating point

  • Pentode grid voltage

    -2 V

    Published operating point

  • Pentode anode current

    10.5 mA

    Published value

  • Pentode screen current

    4.5 mA

    Published value

  • Pentode internal resistance

    0.4 MOhm

    Published value

  • Pentode equivalent noise resistance

    1.5 kOhm

    Published value

  • Pentode transconductance

    4 to 8.4 mA/V

    Published tolerance

  • Triode input capacitance

    2.3 pF

    Published value

  • Triode output capacitance

    0.3 pF

    Published value

  • Triode transfer capacitance

    1.1 to 1.8 pF

    Published range

  • Pentode input capacitance

    5.5 pF

    Published value

  • Pentode output capacitance

    3.2 pF

    Published value

  • Pentode transfer capacitance

    0.025 pF

    Maximum