PB31000

Philips RF pentode designed for high-frequency power-amplifier service. Its industrial construction and ratings identify it as a transmitter-class output device rather than a receiving tube.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 12 V / 7.5 A

Description

RF pentode for high-frequency power-amplifier service.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 12 V
Nominal heater current: 7.5 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: 0.0065 S
Amplification factor: 4
Max plate voltage: 3000 V
Max screen voltage: 1000 V
Max plate dissipation: 600 W
Max screen dissipation: 100 W
Max cathode current: 700 mA

Promoted where the locked schema directly matches published RF values; frequency/service-specific limits and operating conditions are 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

1963 Philips Electron Tubes Handbook V4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
3000 V
RFPowerTube
Maximum screen voltage
1000 V
RFPowerTube
Application
RF pentode for high-frequency power-amplifier service.
SourceDescription
Service category
RF/AF power service as specified in source
RFPowerTube
Heater/filament voltage
12 V
RFPowerTube
Heater/filament current
7.5 A
RFPowerTube

Construction

Heating method
Direct
RFPowerTube
Device class
Pentode
RFPowerTube

Capacitance

Plate capacitance
20 pF
RFPowerTube
Control-grid capacitance
45 pF
RFPowerTube

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
3000 V
Maximum screen voltage
1000 V
Maximum plate dissipation
600 W
Maximum screen dissipation
100 W
Maximum cathode current
700 mA
Maximum peak cathode current
2.8 A
Operating plate voltage
3000 V
ClassC;Telegraphy
Operating screen voltage
1000 V
ClassC;Telegraphy
Operating plate current
300 mA
ClassC;Telegraphy
RF output power
1250 W
ClassC;Telegraphy
Efficiency
69 %
ClassC;Telegraphy

Characteristics

Transconductance
6500 uS
Screen-grid amplification factor
4

Capacitance

Plate-cathode capacitance
20 pF
Grid-cathode capacitance
45 pF
Plate-grid capacitance
0.05 pF