KF3

Directly heated variable-mu battery pentode for gain-controlled high-frequency amplification with very low filament consumption.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 2 V / 45 mA

Description

KF3 is listed in the supplied valve table as a variable-mu pentode. Published operating and characteristic 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: 2 V
Nominal heater current: 45 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: 2000000 Ω
Transconductance: 0.00085 S
Max plate voltage: 135 V
Max screen voltage: 135 V
Max plate dissipation: 0.5 W
Max screen dissipation: 0.2 W
Max cathode current: 5 mA

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
135 V
Published table operating point
Screen voltage
135 V
Published table operating point

Characteristic

Plate resistance
2000000 ohm
Published table characteristic
Transconductance
850 µS
Published table characteristic
Heater/filament voltage
2 V
Published heater/filament rating
Heater/filament current
45 mA
Published heater/filament rating

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Chauffzge: direct par batterie; vf
2 V
PentodeConnection
alimentation en paralldle If
45 mA
PentodeConnection

Capacitance

Kapazititen Cel
6.2 pF
Ca
5.2 pF

Other

Va = 90
135 V
Va = max
135 V
Wa = max
0.5 W
vegz max
135 V
wg2 = max
0.2 W
vgl (1g1 [1]
0.3 pA
vgl (1g1 [2]
2 V