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Power - Pentode (NOT beam) ·Pentode

PM22D

Directly heated 2 V battery power pentode providing approximately 300 mW Class A audio output.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B4
Base pins
4
Nominal heater
2 V / 300 mA

Description

The Mullard PM22D is a directly heated 2 V battery output pentode with about 300 mW published output.

Socket description

European 4-pin base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B4
Base pins
4
Nominal heater voltage
2 V
Nominal heater current
300 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
Transconductance
0.003 S
Max plate voltage
150 V
Max screen voltage
150 V

Battery audio output pentode.

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

1958 Mullard Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate Voltage

    135 V

    ClassA

  • Screen Voltage

    135 V

    ClassA

  • Plate Current

    5 mA

    ClassA

  • Power Output

    0.3 W

    ClassA

  • Load Resistance

    24000 ohm

    ClassA