E447

Variable-mu pentode documented in Philips valve-table data. Published operating and characteristic values support controlled-gain signal amplification, although the surviving source provides limited explicit application wording.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B5
Base pins: 5
Nominal heater: 4 V / 1.1 A

Description

E447 is listed in the supplied valve table as a variable-mu pentode. Published operating and characteristic values were transcribed from its target row.

Socket description

European 5-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B5
Base pins: 5
Nominal heater voltage: 4 V
Nominal heater current: 1.1 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: 1000000 Ω
Transconductance: 0.0023 S
Max plate voltage: 200 V
Max screen voltage: 100 V

Published target-row operating and characteristic values reviewed.

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

1938 Philips Miniwatt Vacuum Tube Catalog

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
200 V
Published European table row
Screen voltage
100 V
Published European table row
Plate current
4.5 mA
Published European table row
Control-grid bias
2 V
Published European table row

Characteristic

Plate resistance
1000000 ohm
Published European table row
Transconductance
2300 µS
Published European table row
Heater/filament voltage
4 V
Published European table row
Heater/filament current
1.1 A
Published European table row

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Anode current
4.5 mA
Published datasheet value
Anode current
0.01 mA
Published datasheet value
Anode voltage
200 V
Published datasheet value
Screen-grid voltage
125 V
Published datasheet value
Internal resistance
1 M.Ohm
Published datasheet value
Internal resistance
10 M.Ohm
Published datasheet value