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Voltage Pentode ·Pentode

KF1

Directly heated 2 V battery pentode designed for RF and IF amplification in portable radio equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
2 V / 200 mA

Description

The Telefunken KF1 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
900000 Ω
Transconductance
0.0016 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

  • Plate current

    3 mA

    Published table operating point

  • Control-grid bias

    0 V

    Published table operating point

  • Alternate plate voltage

    90 V

    OperatingPoint2

  • Alternate screen voltage

    90 V

    OperatingPoint2

  • Alternate plate current

    1.1 mA

    OperatingPoint2

Characteristic

  • Plate resistance

    900000 ohm

    Published table characteristic

  • Transconductance

    1600 µS

    Published table characteristic

  • Heater/filament voltage

    2 V

    Published heater/filament rating

  • Heater/filament current

    200 mA

    Published heater/filament rating

  • Alternate transconductance

    1500 µS

    OperatingPoint2

Data set 02

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Heizspannung .....oovrivneanesneanraeraieena, Vi =22

    2 V

  • Helzstrom ovvvveee et eranonieeenaeneas If - ca. 0,2 ca

    200 mA

  • Anodenspannung . .......oriiarrieiiaiiaa Va — 135

    90 V

  • Schirmgitterspannung . ....covesevenrereaenann., Vg2 - 135

    90 V

  • Normaler Anodenstrom .......ccooveevennvo.en. la == 3,0

    1.1 A

  • e inere iir S max

    1.8 mA/V

  • Norm. Steilhelt vttt S rorm = 1,8

    1 mA/V

  • Norm. innerer Widerstand .....ccovvvviiee n Rinorm=- 0,9

    1.5 MΩ

  • L+ t—Vaig2

    135 V

Characteristic

  • ~48 40 32 24 6 08 0 0F 16 0 80

    0 %