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Tube Tinker — Electron Tube Database
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Power - TV Vertical Output ·Tetrode

30P12

Output tetrode designed for audio amplifiers and television field-output stages. Its power capability supports either low-frequency load drive or vertical-deflection service.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
12.6 V / 300 mA

Description

Output tetrode for audio amplifiers and television field-output stages.

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
12.6 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

Tetrode

X-ray radiationInterelectrode capacitances
Transconductance
0.0083 S
Amplification factor
13
Max plate voltage
250 V
Max screen voltage
250 V
Max plate dissipation
6 W
Max screen dissipation
1.8 W
Max cathode current
50 mA

Output tetrode; speech/music screen dissipation 2.7 W is preserved as a parameter.

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

1960 Mazda

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • SpeechMusicMaxScreenDissipation

    2.7 W

Characteristics

  • Typical Anode Voltage

    170 V

    gm measurement

  • Typical Screen Voltage

    180 V

    gm measurement

  • TypicalAnodeCurrent

    35 mA

    gm measurement

Data set 02

1973 Mazda Valves Binder 2

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Power Output

    2.25 W

    ClassA;OneTube;Plate 170 V