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2D9S

Russian diode documented in technical reference literature; available source material does not clearly establish a narrower specialized functional role.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 3.7 V / 550 mA

Description

2D9S diode from a Russian vacuum-tube reference; technical description translated to English.

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: 3.7 V
Nominal heater current: 550 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

Diode

X-ray radiationInterelectrode capacitances

Transconductance: 0.000029999999999999997 S
Max plate voltage: 500 V

Electrical values extracted only from the filename-designated tube block; page-edge fragments excluded.

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

1981 Russian Tubes Katsnelson and Larionov

Published operating points and test conditions from this source.

SECTION 1

Diode

Characteristics

Heater current
<550 mA
Ток накала . . . . ее < 550 мА
Plate current
1 МА
Ток анода . . . к, ‚ . , 1МА
Transconductance
717 %
Относительная крутизна эмиссионной характеристики ‚ 717%
Service life
>500 h
Наработка. . . . . . .. .. .к. .В ее 2>500 ч
Plate current
7 mA
Ток анода . . .. к, ‚ ‚ —&7 мА
Transconductance
<0.03 mA/V
Крутизна характеристики тока насыщения'; ‚ ; — <0,03 мА/В