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Power - Tetrode (NOT beam) ·Tetrode

3D21A-B

No short description is recorded for this tube.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
-
Base pins
-
Nominal heater
6.3 V / 1.7 A

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
1.7 A
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

Tetrode

X-ray radiationInterelectrode capacitances
Transconductance
0.00055 S
Max plate voltage
3500 V
Max screen voltage
850 V
Max plate dissipation
15 W
Max screen dissipation
3 W
Max grid dissipation
0.5 W

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

1960 CBS Hytron

Published operating points and test conditions from this source.

SECTION 1

Tetrode

Other

  • Plate Voltage

    600 V

  • Screen Voltage

    300 V

  • Grid Voltage

    -30 V

  • Plate Current

    30 mA

  • Screen Current

    2.5 mA