5889

Subminiature electrometer pentode with exceptionally low filament-current requirements. Designed for ultra-low-current measurement circuits, it serves sensitive electrometer instrumentation where input loading and heater power must be kept extremely small.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 1.25 V / 7.5 mA

Description

Subminiature electrometer pentode with very low filament current for ultra-low-current measurement service.

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: 1.25 V
Nominal heater current: 7.5 mA
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

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.00001 S
Amplification factor: 250
Max plate voltage: 12 V
Max cathode current: 0.2 mA

Published maximum ratings and characteristics promoted from the approved source; repeated identical sections compressed 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

1938 Raytheon

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

HeaterVoltageNominal
1.25 V
Nominal
HeaterCurrentNominal
7.5 mA
Nominal
Maximum Plate Voltage
12 V
Maximum Cathode Current
0.2 mA

Characteristic

Transconductance
10 µS
Typical
Amplification Factor
250
Typical