RE78

Early low-filament-current oxide-filament receiver triode for RF, detector, and moderate audio-frequency amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 2.3 V / 65 mA

Description

Early low-filament-current oxide-filament receiver triode for RF, detector, and moderate AF 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: 2.3 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

Triode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Published ratings and characteristics promoted from the supplied Telefunken source where explicitly readable. Telefunken RE78 early directly heated receiver triode using a thorium-containing filament (not oxide-coated), suitable for RF, detector and moderate AF amplification. Approximate filament 2.3 V and 0.06–0.07 A; recommended plate operating range 40–90 V and emission about 5–8 mA. Manufacturer warns against excessive filament voltage. Related RE79 and RE205 versions differ in base arrangements.

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

1959 Telefunken

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

HeaterOrFilamentVoltage
2.3 V
HeaterOrFilamentCurrent
65 mA
PlateVoltageRange
40-90 V
EmissionMinimum
5 mA
EmissionMaximum
8 mA