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Tube Tinker — Electron Tube Database
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Power - Tetrode (NOT beam) ·Tetrode

4260A

Standard Valves directly heated tetrode with published operating data. Its filamentary construction and power ratings support output-stage service rather than ordinary small-signal amplification.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
UX4
Base pins
4
Nominal heater
10 V / 3.25 A

Description

The 4260A is a tetrode described in the Standard Valves datasheet, using a directly heated filament cathode and published operating data.

Socket description

Medium-shell UX 4-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
UX4
Base pins
4
Nominal heater voltage
10 V
Nominal heater current
3.25 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

Tetrode

X-ray radiationInterelectrode capacitances
Plate resistance
175000 Ω
Max plate voltage
3000 V
Max plate dissipation
100 W
Max screen dissipation
15 W
Max cathode current
100 mA

Published ratings and characteristics promoted where directly established by the 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

1937 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

  • Total emission

    1.5 A

    Published datasheet value

  • Grid-anode capacitance

    9 pF

    Published datasheet value

  • Input capacitance

    78 pF

    Published datasheet value

  • Output capacitance

    6.75 pF

    Published datasheet value

Other

  • Maximum frequency for above ratings

    30 MHz

    Published datasheet value

  • Maximum direct grid current

    40 mA

    Published datasheet value

Data set 02

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Maximum direct anode current

    100 mA

    Maximum safe operating rating