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Voltage Pentode ·Pentode

6BX6

General-purpose high-slope pentode for RF, IF, video-amplifier, and mixer service in television receivers.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 9AQ
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 300 mA

Description

General-purpose pentode for RF, IF, video-amplifier, or mixer service in television receivers.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 9AQ
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 300 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9AQ - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1K	A	K — Cathode EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AQ
PIN2G1	A	G1 — Control Grid EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AQ
PIN3K	A	K — Cathode EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AQ
PIN4H	—	H — Heater EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AQ
PIN5H	—	H — Heater EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AQ
PIN6IS	A	IS — Internal Screen EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AQ
PIN7P	A	P — Plate (Anode) EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AQ
PIN8G2	A	G2 — Screen Grid EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AQ
PIN9G3	A	G3 — Suppressor Grid EIA chart transcription, manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AQ

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 400000 Ω
Transconductance: 0.0068 S
Max plate voltage: 300 V
Max screen voltage: 300 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.5 W
Max cathode current: 25 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

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Screen Voltage
300 V
Maximum Plate Dissipation
2.5 W
Maximum Screen Dissipation
0.5 W
Maximum Cathode Current
25 mA

Characteristic

Transconductance
7400 µS
Typical
Plate Resistance
1000000 ohm
Typical

Data set 02

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

Heater Voltage
6.3 V
Heater Current
300 mA

Data set 03

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Maximum plate voltage
250 V
Published handbook rating
Maximum screen voltage
250 V
Published handbook rating
Plate voltage
170 V
ClassA
Screen voltage
170 V
ClassA
Control-grid bias
2 V
ClassA
Plate current
10 mA
ClassA
Screen current
2.5 mA
ClassA

Characteristic

Plate resistance
400000 ohm
Published handbook characteristic
Transconductance
7200 µS
Published handbook characteristic
Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating

Data set 04

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Plate voltage
170 V
Point1
Screen-grid voltage
170 V
Point1
Control-grid voltage
-2 V
Point1
Plate current
10 mA
Point1
Screen-grid current
2.5 mA
Point1
Transconductance
7400 uS
Point1
Plate resistance
400000 Ohm
Point1
Screen-to-control-grid amplification factor
50 ratio
Point1
Equivalent noise resistance
1000 Ohm
Point1
Plate voltage
200 V
Point2
Screen-grid voltage
200 V
Point2
Control-grid voltage
-2.5 V
Point2
Transconductance
7100 uS
Point2
Plate resistance
550000 Ohm
Point2

Capacitance

Input capacitance
7 pF
Output capacitance
3 pF
Grid-to-plate capacitance maximum
0.007 pF

Data set 05

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Pentode

Other

Plate voltage
250 V
RFIFVideoAmplifier
Screen voltage
250 V
RFIFVideoAmplifier
Control-grid voltage
-3.5 V
RFIFVideoAmplifier
Plate current
10 mA
RFIFVideoAmplifier
Screen current
2.8 mA
RFIFVideoAmplifier

Characteristic

Plate resistance
65000 Ω
Section1
Transconductance
6500 µS
Section1
Amplification factor
50
Section1

Data set 06

1999 Philips 0-D

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Heater voltage
6.3 V
Heater current
300 mA
Plate voltage
170 V
Screen voltage
170 V
Plate current
10 mA
Screen current
2.5 mA
Transconductance
7200 uS
Plate resistance
400000 ohm
Screen-grid amplification factor
50
Equivalent noise resistance
1000 ohm

Capacitance

Input capacitance
7.2 pF
Output capacitance
3.4 pF
Plate-grid capacitance maximum
0.007 pF