P500

Philips/Valvo directly heated transmitting pentode rated for high-power Class-C telegraphy service. Its filamentary construction and power ratings suit radio-frequency transmitter output stages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 10 V / 5 A

Description

Philips/Valvo P500 SFR transmitting pentode, directly heated and rated for high-power class-C telegraphy 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: 10 V
Nominal heater current: 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: 0.006 S
Max plate voltage: 2000 V
Max plate dissipation: 300 W

Published ratings and characteristics were promoted when unambiguous; additional operating values are preserved in TUBE_SECTION_PARAMETER.

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

194X Wehrmacht Rohren

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
2000 V
Class C telegraphy
Plate current
420 mA
Class C telegraphy
Screen voltage
850 V
Class C telegraphy
Control-grid voltage
-260 V
Class C telegraphy
Drive power
4 W
Class C telegraphy
RF output power
550 W
Class C telegraphy