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7234

National Union high-voltage pentode designed for control, regulator, and high-voltage sweep circuits operating in the kilovolt range. Its defining role is high-voltage electronic control rather than ordinary receiving or audio amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 150 mA

Description

National Union 7234 high-voltage pentode for control, regulator, and high-voltage sweep circuits operating in the kilovolt range.

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: 150 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

Plate resistance: 1000000 Ω
Transconductance: 0.0038 S
Max screen voltage: 150 V
Max plate dissipation: 10 W
Max screen dissipation: 0.5 W
Max cathode current: 5 mA

Promoted ratings/characteristics read from the approved National Union datasheet.

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

1938 National Union

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Grid to plate capacitance
0.0159 pF
Direct interelectrode capacitance
Input capacitance
4.06 pF
Direct interelectrode capacitance
Output capacitance
2.23 pF
Direct interelectrode capacitance