B2047

Variable-mu pentode documented in manufacturer tube-table data. Its controlled characteristic identifies it as a gain-regulated signal amplifier, although the available source provides limited application detail beyond the published electrical values.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 20 V / 180 mA

Description

B2047 is listed in the supplied tube table as a variable-mu pentode. Published electrical values were transcribed from its target row.

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: 20 V
Nominal heater current: 180 mA
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: 1100000 Ω
Transconductance: 0.0022 S
Max plate voltage: 200 V
Max screen voltage: 250 V
Max plate dissipation: 1.5 W
Max screen dissipation: 0.3 W

Published table ratings and electrical characteristics reviewed; ambiguous cells were not inferred.

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

Maximum plate voltage
200 V
Published table rating
Plate voltage
200 V
Published operating point
Screen voltage
100 V
Published operating point
Control-grid bias
4 V
Published operating point
Screen current
1.8 mA
Published operating point

Characteristic

Transconductance
2200 µS
Published table characteristic
Heater/filament voltage
20 V
Published heater/filament rating
Heater/filament current
180 mA
Published heater/filament rating

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Normal plate current
4 mA
Vg≈-2V
Average screen-grid current
1.7 mA