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3D21WB

Rugged reliable pulse beam-power tetrode for high-voltage, high-current pulse service in modulators, deflection amplifiers, oscillators, and regulated power supplies.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: 6
Nominal heater: 12.6 V / 850 mA

Description

Rugged, reliable pulse beam-power tetrode designed for high-voltage, high-pulse-current service in modulators, deflection amplifiers, oscillators, and regulated supplies.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: 6
Nominal heater voltage: 12.6 V
Nominal heater current: 850 mA
Parallel heater voltage: 6.3 V
Parallel heater current: 1.7 A
Series capable: Yes

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

Beam Power

X-ray radiationInterelectrode capacitances

Max plate voltage: 4000 V
Max screen voltage: 850 V
Max plate dissipation: 40 W
Max screen dissipation: 3.5 W
Max grid dissipation: 0.5 W
Max cathode current: 175 mA

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Beam Power

Other

DC Plate Voltage — Note 1..... . i i eeen
4000 VOLTS
Published datasheet value
Peak Plate Voltage including Transient—Note 2 ....... ..o iiiiiinn.n
5000 VOLTS
Published datasheet value
Maximum heater-cathode voltage
500 V
Either polarity