TKF4

Directly heated battery high-frequency pentode for RF amplification, detector service, and regenerative receiver stages. High plate resistance provides useful gain with economical filament consumption.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B5
Base pins: 5
Nominal heater: 2 V / 65 mA

Description

Battery high-frequency pentode intended for RF, detector and regenerative receiver stages.

Socket description

European 5-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B5
Base pins: 5
Nominal heater voltage: 2 V
Nominal heater current: 65 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: 1000000 Ω
Transconductance: 0.0008 S

Published ratings and characteristics promoted where clearly stated; repeated identical sections compressed where applicable.

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

195X Tunsgram

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater or filament voltage
2 V
Published nominal value
Heater or filament current
65 mA
Published nominal value
Transconductance
800 µS
Published operating characteristic