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KT41

Output power tetrode designed for receiver audio stages, providing efficient Class-A or Class-AB power amplification from typical receiving-equipment supply voltages.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 4 V / 2 A

Description

High-slope output tetrode for sensitive Class-A and Class-AB audio service.

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: 4 V
Nominal heater current: 2 A
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: 0.0105 S
Max plate voltage: 250 V
Max screen voltage: 250 V

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

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

Heater/Filament Voltage
4 V
Heater/Filament Current
2 A
Transconductance
10500 uS

Other

Maximum/Published Anode Voltage
250 V
Maximum/Published Screen Voltage
250 V
Maximum Published Power Output
8.6 W
Two-valve service where applicable
Single-Valve Output
4.3 W
250 V plate/screen
Push-Pull Class AB Output
8.6 W
Two valves

Capacitance

Grid-Anode Capacitance
1.3 pF
Anode-Cathode Capacitance
1.3 pF
Grid-Cathode Capacitance
21 pF