CK5885

Directly heated subminiature twin tetrode designed for electrometer service, with extremely low nominal control-grid current for precision measurement.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8CC
Socket code: -
Base pins: 8
Nominal heater: 1.25 V / 20 mA

Description

Subminiature directly heated twin tetrode for electrometer service with extremely low nominal control-grid current.

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8CC
Socket code: -
Base pins: 8
Nominal heater voltage: 1.25 V
Nominal heater current: 20 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8CC - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.00016 S
Amplification factor: 2.4
Max plate voltage: 13.5 V

Promoted only from clearly identified printed electrical values; additional values retained in TUBE_SECTION_PARAMETER.

Section 2

Tetrode

X-ray radiationInterelectrode capacitances

Transconductance: 0.00016 S
Amplification factor: 2.4
Max plate voltage: 13.5 V

Second physical twin-tetrode section restored.

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

Tetrode

Other

Plate voltage
13.5 V
Electrometer;EachSection
Control-grid voltage
-3 V
Electrometer;EachSection
Plate current
0.185 mA
Electrometer;EachSection

Characteristic

Transconductance
160 µS
Electrometer;EachSection
Amplification factor
2.4
Electrometer;EachSection
Nominal control-grid current
0.000000001 mA
Electrometer;EachSection