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Power - Pentode (NOT beam) ·Pentode

CK539DX

Extremely low-drain subminiature power pentode using a 1.25 V, 15 mA filament.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
5J
Socket code
B5D
Base pins
5
Nominal heater
1.25 V / 15 mA

Description

Directly heated subminiature pentode for power amplifier service.

Socket description

Subminiature wire-ended

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
5J
Socket code
B5D
Base pins
5
Nominal heater voltage
1.25 V
Nominal heater current
15 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

5J - 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

Pentode

X-ray radiationInterelectrode capacitances
Plate resistance
250000 Ω
Transconductance
0.0003 S

Published subminiature operating-table characteristics; plate/screen voltages below are typical operating values, not promoted as maxima.

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

195X Raytheon Special Purpose Tubes

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

  • Plate voltage

    22.5 V

  • Grid 1 voltage

    -1.4 V

  • Grid 2 voltage

    22.5 V

  • Plate current

    0.25 mA

  • Grid 2 current

    0.075 mA

  • Power output

    2.2 mW

  • Load resistance

    0.1 MOhm

Characteristic

  • Plate resistance

    0.25 MOhm

  • Transconductance

    300 uS