5898

Subminiature high-mu triode capable of UHF operation and designed for severe shock, vibration, and high-temperature service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 8DK
Socket code: B8D
Base pins: 8
Nominal heater: 6.3 V / 150 mA

Description

Subminiature high-mu triode capable of UHF operation and intended for severe shock, vibration, and high-temperature service.

Socket description

Subminiature 8-lead

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8DK
Socket code: B8D
Base pins: 8
Nominal heater voltage: 6.3 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8DK - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G1	A	G1 — Control Grid EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DK
PIN3H	—	H — Heater EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DK
PIN5K	A	K — Cathode EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DK
PIN6H	—	H — Heater EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DK
PIN8P	A	P — Plate (Anode) EIA source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8DK

Section ratings

1 physical section, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 2700 Ω
Transconductance: 0.0259 S
Amplification factor: 70
Max plate voltage: 165 V
Max plate dissipation: 0.55 W

Promoted from clearly identified printed ratings/characteristics; additional published operating points, capacitances, and specialized ratings retained in TUBE_SECTION_PARAMETER.

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 General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Capacitance

Input capacitance
2.4 pF
Section1
Output capacitance
0.6 pF
Section1
Grid-to-plate capacitance
0.7 pF
Section1

Other

Plate voltage
150 V
ClassA
Cathode resistor
680 Ω
ClassA
Plate current
1.7 mA
ClassA

Characteristic

Plate resistance
2700 Ω
ClassA
Transconductance
25900 µS
ClassA
Amplification factor
70
ClassA