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Voltage Pentode ·Pentode

KF2

Directly heated Telefunken battery pentode for high-gain RF and IF voltage amplification in portable receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 2 V / 200 mA

Description

The Telefunken KF2 is a directly heated 2 V battery pentode for RF/IF amplification.

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: 200 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: 1900000 Ω
Transconductance: 0.0014 S

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
1900000 ohm
Published table characteristic
Transconductance
1400 µS
Published table characteristic
Heater/filament voltage
2 V
Published heater/filament rating
Heater/filament current
200 mA
Published heater/filament rating

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heizspann. . . .. Vf [1]
2 V
Heizspann. . . .. Vf [2]
22 V
Heizstrom .... If = ca [1]
200 mA
Heizstrom .... If = ca [2]
200 mA
Anodensp. .. . Va — [1]
135 V
Anodensp. .. . Va — [2]
90 V
spannung.... Vg2 [1]
135 V
spannung.... Vg2 [2]
90 V
VOrsp. ...... Vgl — Obis— [1]
16 V
VOrsp. ...... Vgl — Obis— [2]
11 V
Anodenstr. .. . la(Vgl [1]
0 V
Anodenstr. .. . la(Vgl [2]
3 mA
Anodenstr. .. . la(Vgl [3]
0 V
Anodenstr. .. . la(Vgl [4]
1.4 mA
Anodenstr. ... . la (Vgl =— [1]
16 V
Anodenstr. ... . la (Vgl =— [2]
0.01 mA
Anodenstr. ... . la (Vgl =— [3]
11 V
Anodenstr. ... . la (Vgl =— [4]
0.01 mA
Norm. Steilh... 8 norm — [1]
1.3 mA/V
Norm. Steilh... 8 norm — [2]
8 mA/V
Min. Steilh. .. §(Vgl -z — [1]
16 V
Min. Steilh. .. §(Vgl -z — [2]
0.002 mA/V
Min. Steilh. .. §(Vgl -z — [3]
11 V
Min. Steilh. .. §(Vgl -z — [4]
0.002 mA/V
Widerst. .... Rinorm — [1]
1.1 MΩ
Widerst. .... Rinorm — [2]
1.9 MΩ

Characteristic

Va=Vg2
135 V
// y Vaulg2
90 V
d kf2 Vg2
135 V
B Vg2
90 V
LA ?
205 V