Alternatives & variations Download PDF datasheet

5D21

Heater-cathode pulse-amplifier tetrode designed for high-current pulse service, with a published peak anode-current rating of 15 amperes into a non-inductive load.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: B4A
Base pins: 4
Nominal heater: 26 V / 2 A

Description

Heater-cathode pulse-amplifier tetrode with a 15 A peak-anode-current rating into a non-inductive load.

Socket description

4-contact B4A physical base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: B4A
Base pins: 4
Nominal heater voltage: 26 V
Nominal heater current: 2 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

Max plate voltage: 20000 V
Max screen voltage: 1250 V
Max plate dissipation: 60 W
Max screen dissipation: 8 W
Max grid dissipation: 1 W
Max cathode current: 30 mA

Published ratings/characteristics promoted where applicable.

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

1946 Standard Telephone and Cables

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

Input capacitance
375 pF
Published datasheet value
Output capacitance
75 pF
Published datasheet value
Anode-grid capacitance
2 pF
Published datasheet value
Maximum peak anode current
15 A
Published datasheet value
Maximum negative grid voltage
1 kV
Published datasheet value
Maximum peak positive grid voltage
300 V
Published datasheet value
Maximum peak grid current
2 A
Published datasheet value

Data set 02

194X Western Electric Random

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristics

Heater/filament voltage
26 V
Heater/filament current
2.1 A

Other

Maximum plate/anode voltage
20000 V
Maximum screen voltage
1250 V
Maximum plate/anode dissipation
60 W
Maximum screen dissipation
8 W
Maximum plate/cathode current
30 mA

Data set 03

1956 Western Electric Tubes

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Characteristic

HeaterOrFilamentVoltage
26 V
HeaterOrFilamentCurrent
2.1 A

Other

Peak Anode Current
15 A
NonInductiveLoad