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Voltage Pentode - Sharp Cutoff (single) ·Pentode

EM8

Low-heater-power Russian pentode for specialized small-signal electronic service; available source does not establish a narrower application reliably.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
6.3 V / 100 mA

Description

Pentode vacuum tube described in the Russian reference source. Technical description is translated to English from the complete filename-matched entry.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B9A
Base pins
9
Nominal heater voltage
6.3 V
Nominal heater current
100 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

Pentode

X-ray radiationInterelectrode capacitances

No fixed ratings are recorded for this section.

Filename-matched Russian entry only.

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

Pentode

Characteristics

  • Heater current

    100 mA

    Translated from Russian source; Ток накала . ‚ . . , .. . ., .. ., ‚ (100+-15) мА

  • Plate current

    8 mA

    Translated from Russian source; Ток анода . . в в . в в у ееа , 1‚8Ё8;Ё МА

  • Transconductance

    3 mA/V

    Translated from Russian source; Крутизна характеристики . . . . .. .к. , . 0,800-3 МА/В

  • Amplification factor

    80

    Translated from Russian source; Коэффициент усиления . . ва . 80

  • Heater current

    10 mA

    Translated from Russian source; Ток накала . . . . . . . . .. (90:!:10) мА

  • Plate current

    1607 mA

    Translated from Russian source; Ток анода . .. , . . . . к, 1607

  • Transconductance

    -40 mA/V

    Translated from Russian source; Крутизна характеристики в ее (110=-40) мА/В

  • Capacitance

    1 pF

    Translated from Russian source; Емкость входная . . . . . . ,. .. ,. 1 пФ

  • Transconductance

    2 mA/V

    Translated from Russian source; изменение крутизны характеристики ‚ к в ‚ <2Е40%

Other

  • Service life

    1000 h

    Translated from Russian source; Наработка . . . , . .. .. ., ‚ 1000 ч

  • Heater voltage

    6.6 V

    Translated from Russian source; Напряжение накала . . . . . . . . . ‚ 6—6,6 В

  • Plate voltage

    20 V

    Translated from Russian source; Напряжение анода . . . . . . ., , ‚ 20 В

  • Service life

    500 h

    Translated from Russian source; Наработка . . . . . . . . .. ,. , > 500 ч

  • Heater voltage

    6.6 V

    Translated from Russian source; Напряжение накала . . . . . . . . . . . . . , (6—6,6) В