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

Voltage - Triode (single) ·Triode

SD1A

Telefunken short-wave oscillator triode for operation down to approximately 50 cm wavelength.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
1.9 V / 500 mA

Description

SD1A is a Telefunken short-wave triode intended for oscillator service down to approximately 50 cm wavelength.

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
1.9 V
Nominal heater current
500 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
Plate resistance
4500 Ω
Transconductance
0.0032 S
Amplification factor
14.3
Max plate voltage
150 V
Max plate dissipation
1.4 W

Published maximum ratings and characteristics promoted from the approved datasheet; additional useful values retained as parameters.

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

194X Wehrmacht Rohren

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Heater Voltage

    1.9 V

    Nominal published value

  • Heater Current

    500 mA

    Nominal/approximate published value

  • Maximum Anode Voltage

    150 V

    Published datasheet value

  • Maximum Anode Dissipation

    1.4 W

    Published datasheet value

Characteristics

  • Plate Resistance

    4500 ohm

    Published datasheet value

  • Transconductance

    0.0032 A/V

    Published datasheet value

  • Amplification Factor

    14.3

    Published datasheet value