7235

High-mu triode amplifier for regulated power supplies, voltage amplifiers, television, oscilloscopes, and other high-voltage low-current circuits.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 300 mA

Description

National Union 7235 miniature high-mu triode amplifier for regulated power supplies, voltage amplifiers, television, oscilloscope, and other high-voltage low-current circuits.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 6.3 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

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.00085 S
Amplification factor: 550
Max plate voltage: 10000 V
Max plate dissipation: 10 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

Triode

Characteristics

Grid to plate capacitance
1.03 pF
Direct interelectrode capacitance
Grid to cathode capacitance
2.24 pF
Direct interelectrode capacitance
Plate to cathode capacitance
1.03 pF
Direct interelectrode capacitance