CK5967

Directly heated subminiature twin triode designed for RF amplifier service, emphasizing compact high-frequency operation rather than ordinary audio-frequency amplification.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 8CK
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater: 1.25 V / 120 mA

Description

Subminiature directly heated twin triode for RF amplifier service.

Socket description

Subminiature 8-lead base

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 8CK
Socket code: SUBMINIATURE8
Base pins: 8
Nominal heater voltage: 1.25 V
Nominal heater current: 120 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

8CK - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN11P2	A	P — Plate (Anode) Original EIA label 1P2; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CK
PIN21K	A	K — Cathode Original EIA label 1K; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CK
PIN41P1	A	P — Plate (Anode) Original EIA label 1P1; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CK
PIN52G	B	OTHER — Other Identified Element Ambiguous 2G in source; canonical OTHER (40) pending identification	Unverified EIA Base Connections, printed page 129, 8CK
PIN62K	B	K — Cathode Original EIA label 2K; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CK
PIN7H	—	H — Heater Original EIA label H; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CK
PIN8H	—	H — Heater Original EIA label H; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 129, 8CK

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.002 S
Amplification factor: 18
Max plate voltage: 45 V

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

Section 2

Triode

X-ray radiationInterelectrode capacitances

Transconductance: 0.002 S
Amplification factor: 18
Max plate voltage: 45 V

Second physical triode section; electrically identical twin section.

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

Triode

Other

Plate voltage
45 V
RFAmplifier;EachSection
Grid resistor
5 MΩ
RFAmplifier;EachSection
Plate current
3 mA
RFAmplifier;EachSection

Characteristic

Amplification factor
18
EachSection
Transconductance
2000 µS
EachSection