26CG6

Remote-cutoff pentode using a 26.5 V, 70 mA heater. Manufacturer handbook data provide representative operating characteristics for controlled-gain signal amplification, with the extended heater voltage suited to series or specialized supply arrangements.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7BK
Socket code: B7G
Base pins: 7
Nominal heater: 26.5 V / 70 mA

Description

26CG6 is listed in the supplied receiving-tube handbook as a remote-cutoff pentode. The published heater/filament rating is 26.5 V at 0.07 A. Maximum ratings and representative operating characteristics were transcribed from the supplied table.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7BK
Socket code: B7G
Base pins: 7
Nominal heater voltage: 26.5 V
Nominal heater current: 70 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7BK - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G1	A	G1 — Control Grid EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BK
PIN2G3	A	G3 — Suppressor GridGroup 7BK2 EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BK
PIN2IS	A	IS — Internal ScreenGroup 7BK2 EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BK
PIN3H	—	H — Heater EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BK
PIN4H	—	H — Heater EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BK
PIN5P	A	P — Plate (Anode) EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BK
PIN6G2	A	G2 — Screen Grid EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BK
PIN7K	A	K — Cathode EIA chart transcription; independent manufacturer confirmation pending	Unverified EIA Base Connections, printed page 128, 7BK

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 720000 Ω
Transconductance: 0.002 S
Max plate voltage: 300 V
Max screen voltage: 150 V

Published maximum ratings, representative operating conditions, rectifier service data, and capacitance columns reviewed.

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

Pentode

Other

Maximum plate voltage
300 V
Published handbook rating
Maximum screen voltage
150 V
Published handbook rating
Plate voltage
250 V
ClassA
Screen voltage
150 V
ClassA
Control-grid bias
8 V
ClassA
Plate current
9 mA
ClassA
Screen current
2.3 mA
ClassA

Characteristic

Plate resistance
720000 ohm
Published handbook characteristic
Transconductance
2000 µS
Published handbook characteristic
Heater/filament voltage
26.5 V
Published heater/filament rating
Heater/filament current
70 mA
Published heater/filament rating

Capacitance

Input capacitance
5 pF
Published capacitance column
Output capacitance
5 pF
Published capacitance column
Grid-to-plate capacitance
0.008 pF
Published capacitance column