Skip to main content
Tube Tinker — Electron Tube Database
Alternatives & variationsDownload PDF datasheet

Power - Triode ·Triode-Triode

RK43

Low-filament-current directly heated twin triode for portable battery equipment, usable as a power amplifier or oscillator and providing documented Class-B audio output.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
2
Base
-
Socket code
MEDIUM6
Base pins
-
Nominal heater
1.5 V / 120 mA

Description

Low-filament-current directly heated twin triode for portable battery-operated power-amplifier and oscillator service.

Socket description

Medium 6-contact base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
MEDIUM6
Base pins
-
Nominal heater voltage
1.5 V
Nominal heater current
120 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

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
10300 Ω
Transconductance
0.0008 S
Amplification factor
8.2
Max plate voltage
180 V

Published ratings/characteristics promoted where directly applicable; identical twin sections are compressed to one section row.

Section 2

Triode

X-ray radiationInterelectrode capacitances
Plate resistance
10300 Ω
Transconductance
0.0008 S
Amplification factor
8.2
Max plate voltage
180 V

Second identical physical triode section.

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 Raytheon Amateur

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Heater or filament voltage

    1.5 V

    Published nominal value

  • Heater or filament current

    120 mA

    Published nominal value

  • Transconductance

    800 µS

    Published characteristic

  • Amplification factor

    8.2

    Published characteristic

Other

  • Audio power output

    0.95 W

    ClassB; TwoTriodes

  • Plate-to-plate load resistance

    24000 ohm

    ClassB; TwoTriodes