6BY7

High-slope variable-mu pentode designed for gain-controlled RF amplification in FM and AM receiver front ends.

Directly heatedCold cathodeCommon cathodeDissimilar

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

Description

High-slope variable-mu RF pentode for FM/AM 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: 500000 Ω
Transconductance: 0.006 S
Amplification factor: 15
Max plate voltage: 250 V
Max screen voltage: 250 V
Max plate dissipation: 2.5 W
Max screen dissipation: 0.65 W
Max cathode current: 15 mA

Published maximum ratings, operating characteristics, rectifier data, and capacitances 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
250 V
Published handbook rating
Maximum screen voltage
250 V
Published handbook rating
Plate voltage
250 V
ClassA
Screen voltage
100 V
ClassA
Control-grid bias
2 V
ClassA
Plate current
10 mA
ClassA
Screen current
2.5 mA
ClassA

Characteristic

Plate resistance
500000 ohm
Published handbook characteristic
Transconductance
6000 µS
Published handbook characteristic
Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating

Capacitance

Input capacitance
7.2 pF
Published capacitance column
Output capacitance
3.7 pF
Published capacitance column
Grid-to-plate capacitance
0.007 pF
Published capacitance column

Data set 02

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristics

Plate voltage
250 V
Point1
Screen-grid voltage
85 V
Point1
Control-grid voltage
-1.8 V
Point1
Plate current
8 mA
Point1
Screen-grid current
2 mA
Point1
Transconductance
5700 uS
Point1
Plate resistance
500000 Ohm
Point1
Screen-to-control-grid amplification factor
15 ratio
Point1
Control-grid voltage for 100-to-1 gm reduction
-30 V
Point1

Capacitance

Input capacitance
7.5 pF
Output capacitance
3.7 pF
Grid-to-plate capacitance maximum
0.007 pF

Data set 03

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
250 V
Screen voltage
100 V
Plate current
10 mA
Screen current
2.5 mA
Transconductance
6000 uS
Plate resistance
500000 ohm
Controlled transconductance
60 uS
RemoteCutoffPoint
Equivalent noise resistance
1500 ohm

Capacitance

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