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C142

Directly heated screen-grid tetrode for high-frequency amplification. Its early screen-grid construction reduces feedback and improves RF gain compared with contemporary triodes.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 10 V / 250 mA

Description

Philips C142 is an AC-filament screen-grid high-frequency amplifier tube, particularly intended for RF amplification, with a 10 V, 0.25 A directly heated cathode.

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: 250 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

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0008 S

Published ratings and characteristics promoted where semantically applicable; additional published values retained as section parameters.

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

Tetrode

Other

Anode voltage range
50 to 150 V
Published datasheet value
Screen-grid voltage range
25 to 75 V
Published datasheet value
Grid bias
-1.5 V
Published datasheet value
Normal anode current
1.7 mA
Published datasheet value

Characteristics

Transconductance
0.8 mA/V
Published datasheet value
Anode-grid capacitance
0.01 pF
Published datasheet value