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Voltage - Triode (under 100V) ·Triode

215A

Western Electric directly heated triode with a one-volt filament for low-power professional or battery-operated electronic service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
SMALL4BAYONET
Base pins
4
Nominal heater
1 V / 250 mA

Description

The Western Electric 215A is a triode listed in the supplied catalog table.

Socket description

Small 4-contact bayonet transmitting-tube base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
SMALL4BAYONET
Base pins
4
Nominal heater voltage
1 V
Nominal heater current
250 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
13700 Ω
Transconductance
0.00042 S
Amplification factor
5.8
Max plate voltage
60 V

Promoted fields mapped from published ratings/characteristics; additional published values preserved in parameter table.

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

1933 Western Electric Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

  • Plate-grid capacitance

    2.6 pF

    Published direct interelectrode capacitance

  • Plate-filament capacitance

    12 pF

    Published direct interelectrode capacitance

Data set 02

1956 Western Electric Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

  • Maximum/Typical Power Output

    0.0029 W

    Catalog-table value

Data set 03

2026 Western Electric 200s

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Filament current

    0.25 ampere

    Filament current 0.25 ampere, d.c.

  • Nominal fi l a m e n t voltage

    1 volt

    Nominal fi l a m e n t voltage 1.0 volt

  • Plate current characteristics as functions of plate voltage are shown in Figure

    7 volt

    Plate current characteristics as functions of plate voltage are shown in Figure 7 for several values

  • area, ABCD, in Figure

    3

    area, ABCD, in Figure 3. Amplification factor, plate resistance, transconductance, and performance

  • The level of the third harmonic in the

    215

    The level of the third harmonic in the 215A tube is usually low and may differ widely in individual

  • Microphonic Noise—With a plate voltage of

    60 volt

    Microphonic Noise—With a plate voltage of 60 volts, a grid bias of —3 volts, and a load

  • resistance of

    100000 ohms

    resistance of 100,000 ohms, the mean microphonic noise output level of the 215A tube, measured

  • LAMENT CURRENT=

    25 AMPERE

    LAMENT CURRENT=0,25 AMPERE D.C