6BH5

Remote-cutoff RF pentode for variable-gain high-frequency amplifier service and automatic gain-control applications.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 9AZ
Socket code: B7G
Base pins: 7
Nominal heater: 6.3 V / 200 mA

Description

Remote-cutoff RF pentode for variable-gain high-frequency amplifier service. Published ratings, characteristics, capacitances, and representative operating conditions were extracted from the approved manual page where available.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 9AZ
Socket code: B7G
Base pins: 7
Nominal heater voltage: 6.3 V
Nominal heater current: 200 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9AZ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G2	A	G2 — Screen Grid Original EIA label preserved, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AZ
PIN2G1	A	G1 — Control Grid Original EIA label preserved, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AZ
PIN3G3	A	G3 — Suppressor GridGroup 9AZ3 Original EIA label preserved, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AZ
PIN3IS	A	IS — Internal ScreenGroup 9AZ3 Original EIA label preserved, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AZ
PIN3K	A	K — CathodeGroup 9AZ3 Original EIA label preserved, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AZ
PIN4H	—	H — Heater Original EIA label preserved, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AZ
PIN5H	—	H — Heater Original EIA label preserved, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AZ
PIN6P	A	P — Plate (Anode) Original EIA label preserved, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AZ
PIN7IC	—	IC Original EIA label preserved, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AZ
PIN8IC	—	IC Original EIA label preserved, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AZ

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 1100000 Ω
Transconductance: 0.0022 S
Amplification factor: 18
Max plate voltage: 300 V
Max screen voltage: 125 V
Max plate dissipation: 2 W
Max screen dissipation: 0.3 W
Max cathode current: 10 mA

Remote-cutoff RF pentode for variable-gain high-frequency amplifier service.

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

Plate voltage
250 V
ClassA; OperatingPoint1
Screen voltage
100 V
ClassA; OperatingPoint1
Control-grid bias
2.5 V
ClassA; OperatingPoint1
Plate current
6 mA
ClassA; OperatingPoint1
Screen current
1.7 mA
ClassA; OperatingPoint1
Plate resistance
1100000 ohm
ClassA; OperatingPoint1
Transconductance
2200 uS
ClassA; OperatingPoint1

Data set 02

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
6.3 V
Heater current
200 mA
Plate voltage
250 V
Screen voltage
90 V
Plate current
6 mA
Screen current
1.7 mA
Transconductance
2200 uS
Plate resistance
1100000 ohm
Screen-grid amplification factor
18
Controlled transconductance
22 uS
RemoteCutoffPoint
Equivalent noise resistance
6500 ohm

Capacitance

Input capacitance
5.5 pF
Output capacitance
4.5 pF
Plate-grid capacitance maximum
0.002 pF