4228A

Large water-cooled power triode for multi-kilowatt transmitter service. Approximately 5 kW plate dissipation and 6 kV plate capability support several kilowatts of published push-pull output in major transmitting equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 22 V / 41 A

Description

The 4228A is a water-cooled triode described in the Standard Valves datasheet, using a directly heated filament cathode and published operating data.

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: 22 V
Nominal heater current: 41 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

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 2200 Ω
Transconductance: 0.00818 S
Amplification factor: 18
Max plate voltage: 6000 V
Max plate dissipation: 5000 W
Max grid dissipation: 100 W
Max cathode current: 1.5 A

Explicit alternate/previous designation printed on 3Q150E 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

Triode

Characteristics

Total emission
6 A
Published datasheet value
Grid-anode capacitance
24 pF
Published datasheet value
Anode-filament capacitance
3 pF
Published datasheet value
Grid-filament capacitance
25 pF
Published datasheet value

Other

Maximum frequency for above ratings
3 MHz
Published datasheet value

Data set 02

1947 Standard Valves

Published operating points and test conditions from this source.

SECTION 1

Triode

Construction

Cooling method
Water

Other

Push-pull power output
3.75 kW
PushPull
Maximum anode voltage for anode modulation
4000 V