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Voltage - Triode (single) ·Triode

216A

Filamentary triode for amplifier and oscillator service in professional electronic equipment.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
MEDIUM4BAYONET
Base pins
-
Nominal heater
5.5 V / 1 A

Description

Filamentary triode for amplifier and oscillator service.

Socket description

Medium 4-contact bayonet base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
MEDIUM4BAYONET
Base pins
-
Nominal heater voltage
5.5 V
Nominal heater current
1 A
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
5900 Ω
Amplification factor
5.9
Max plate voltage
160 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

2026 Western Electric 200s

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

  • Normal fi l a m e n t current

    1 ampere

    Normal fi l a m e n t current 1.0 ampere

  • Normal fi l a m e n t voltage

    5 volt

    Normal fi l a m e n t voltage 5 to 6 volts

  • Normal plate current

    6.5 milliamperes

    Normal plate current 6.5 milliamperes

  • Normal plate voltage

    130 volt

    Normal plate voltage 130 volts

  • Normal grid voltage

    -9 volt

    Normal grid voltage —9 volts

  • P l a t e - fi l a m e n t impedance

    5900 ohms

    P l a t e - fi l a m e n t impedance 5900 ohms

Other

  • Maximum safe plate voltage

    160 volt

    Maximum safe plate voltage 160 volts