AL3

Philips pentode documented for amplification or output service with Class-A operating data. Its published ratings support power-capable amplifier operation rather than exclusively small-signal service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: P8A
Base pins: 8
Nominal heater: 4 V / 1.85 A

Description

Philips pentode vacuum tube for amplification or output service. The supplied Philips data sheet provides heater, operating, rating, capacitance, and application information appropriate to this type.

Socket description

European 8-pin side-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: P8A
Base pins: 8
Nominal heater voltage: 4 V
Nominal heater current: 1.85 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

Plate resistance: 50000 Ω
Transconductance: 0.009 S
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 9 W
Max screen dissipation: 1.5 W
Max cathode current: 55 mA

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

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
4 V
Heater current
1.85 A
Transconductance
9000 uS
Plate resistance
50000 ohm

Other

Plate voltage
250 V
ClassA
Screen voltage
250 V
ClassA
Grid voltage
-6.5 V
ClassA
Plate current
36 mA
ClassA
Screen current
4 mA
ClassA
Output power
4.5 W
ClassA
Load resistance
7000 ohm
ClassA