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Power - Pentode (NOT beam) (over 1000V 100W) ·Pentode

PL172

Power pentode designed for RF transmitting, linear RF amplification, oscillation, modulation, or RF/LF power-amplifier service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B7A
Base pins
7
Nominal heater
6 V / 8.2 A

Description

The Penta PL172 is a forced-air-cooled 1000 w power pentode for low-distortion linear rf and high-power amplifier service.

Socket description

Septar 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B7A
Base pins
7
Nominal heater voltage
6 V
Nominal heater current
8.2 A
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
Transconductance
0.023 S
Amplification factor
3.4
Max plate voltage
3000 V
Max screen voltage
750 V
Max plate dissipation
1000 W
Max grid dissipation
5 W

Highest reliable published rating promoted; additional values and operating/application details retained as parameter rows.

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

1965 Penta Labs Power Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Heater/filament voltage

    6 V

  • Heater/filament current

    8.2 A

  • Amplification factor

    3.4

  • Transconductance

    23000 uS

Other

  • Maximum plate voltage

    3000 V

  • Maximum screen voltage

    750 V

  • Maximum plate dissipation

    1000 W

  • Maximum control-grid dissipation

    5 W

  • Source language

    English

  • Minimum cathode heating time

    3 min

  • Useful linear RF output

    1500 W

Capacitance

  • Grid-plate capacitance

    0.09 pF

  • Input capacitance

    58 pF

  • Output capacitance

    18 pF

Application

  • Primary application

    Forced-air-cooled 1000 W power pentode for low-distortion linear RF and high-power amplifier service.

Construction

  • Cooling

    Forced air

  • Electrode structure

    Pentode