6187

Premium ruggedized dual-control pentode for converter, modulator, gating, and AF, IF, or RF amplifier applications. Its independently connected suppressor grid acts as a second control electrode, enabling mixing and switching in demanding airborne equipment.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CM
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 175 mA

Description

Ruggedized sharp-cutoff dual-control pentode voltage amplifier with a separately connected suppressor grid for converter, modulator, gating, AF, IF and RF applications in military and industrial airborne equipment.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7CM
Socket code: B7G
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 175 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7CM - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G1	A	G1 — Control Grid EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN2K	A	K — Cathode EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN3H	—	H — Heater EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN4H	—	H — Heater EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN5P	A	P — Plate (Anode) EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN6G2	A	G2 — Screen Grid EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN7G3	A	G3 — Suppressor GridGroup 7CM7 EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM
PIN7IS	A	IS — Internal ScreenGroup 7CM7 EIA chart transcription; manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CM

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Transconductance: 0.0032 S
Max plate voltage: 200 V
Max screen voltage: 130 V
Max plate dissipation: 1.65 W
Max screen dissipation: 0.55 W
Max cathode current: 20 mA

Published ratings and characteristics promoted where clearly stated; identical repeated 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

Characteristics

Heater or filament voltage
6.3 V
Published nominal value
Heater or filament current
175 mA
Published nominal or representative value
Transconductance
3200 µS
Published characteristic

Other

Maximum plate dissipation
1.65 W
Published maximum rating

Data set 02

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Heater voltage
6.3 V
Heater current
175 mA
Maximum grid 3 voltage
30 V
Plate voltage
120 V
Grid 3 voltage
0 V
Screen voltage
120 V
Grid 1 voltage
-2 V
Plate current
5.2 mA
Screen current
3.5 mA
Maximum plate voltage
200 V
Maximum screen voltage
155 V
Maximum plate dissipation
1.65 W
Maximum screen dissipation
0.55 W
Maximum cathode current
20 mA

Characteristic

Grid1-to-plate transconductance
3200 uS
Grid3-to-plate transconductance
470 uS

Capacitance

Grid1-to-plate capacitance maximum
0.025 pF
Input capacitance
3.9 pF
Output capacitance
2.2 pF