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Voltage Radio Detector Converter ·Pentode-Triode

6U8

Combined triode-pentode intended for VHF oscillator and frequency-converter service.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: 9AE
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 450 mA

Description

Combined triode and pentode intended for VHF oscillator and frequency-converter service.

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: 9AE
Socket code: B9A
Base pins: 9
Nominal heater voltage: 6.3 V
Nominal heater current: 450 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

9AE - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN12P	B	P — Plate (Anode) Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN21G1	A	G1 — Control Grid Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN31G2	A	G2 — Screen Grid Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN4H	—	H — Heater Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN5H	—	H — Heater Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN61P	A	P — Plate (Anode) Chart transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN71G3	A	G3 — Suppressor GridGroup 9AE7 Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN7IS	A	IS — Internal ScreenGroup 9AE7 Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN71K	A	K — CathodeGroup 9AE7 Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN82K	B	K — Cathode Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE
PIN92G1	B	G1 — Control Grid Source transcription; manufacturer confirmation pending	Unverified EIA Base Connections, printed page 131, 9AE

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 5000 Ω
Transconductance: 0.0085 S
Amplification factor: 40
Max plate voltage: 330 V
Max plate dissipation: 2.5 W
Max cathode current: 20 mA

Published ratings and characteristics promoted from the approved German source.

Section 2

Pentode

X-ray radiationInterelectrode capacitances

Plate resistance: 400000 Ω
Transconductance: 0.005 S
Max plate voltage: 330 V
Max screen voltage: 330 V
Max plate dissipation: 3 W
Max screen dissipation: 0.55 W
Max cathode current: 25 mA

Published ratings and characteristics promoted from the approved German source.

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

1950 Sylvania

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Plate Resistance
5000 ohm
Transconductance
8500 µS
Amplification Factor
40

Other

Maximum Plate Voltage
330 V
Maximum Plate Dissipation
3 W
Plate Voltage
150 V
Triode section
Plate Current
18 mA
Triode section

SECTION 2

Pentode

Characteristic

Plate Resistance
400000 ohm
Transconductance
5200 µS

Other

Maximum Plate Voltage
330 V
Maximum Screen Voltage
330 V
Maximum Plate Dissipation
3 W
Maximum Screen Dissipation
0.55 W
Plate Voltage
250 V
Pentode section
Screen Voltage
110 V
Pentode section
Plate Current
10 mA
Pentode section

Data set 02

1953 RFT Rundfunk Technik

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
450 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Plate Dissipation
1.5 W
Maximum Cathode Current
20 mA

Characteristic

Transconductance
8500 µS
Typical
Amplification Factor
55
Typical
Plate Resistance
18000 ohm
Typical

SECTION 2

Pentode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
450 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
5200 µS
Typical
Plate Resistance
300000 ohm
Typical

Data set 03

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater Voltage
6.3 V
Heater Current
450 mA
Application
VHF Television Frequency Changer
BandI;BandII

Data set 04

1958 Mullard Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Application

Application
Local oscillator

SECTION 2

Pentode

Application

Application
Frequency changer / mixer

Other

Maximum frequency for frequency-changer service
220 MHz

Data set 05

195X General Electric Essential Characteristics

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
150 V
ClassA
Cathode resistor
56 ohm
ClassA
Plate current
18 mA
ClassA

Characteristics

Plate resistance
5000 ohm
ClassA
Transconductance
8500 uS
ClassA
Amplification factor
40
ClassA

SECTION 2

Pentode

Other

Plate voltage
250 V
ClassA
Screen voltage
110 V
ClassA
Cathode resistor
68 ohm
ClassA
Plate current
10 mA
ClassA
Screen current
3.5 mA
ClassA

Characteristics

Plate resistance
400000 ohm
ClassA
Transconductance
5200 uS
ClassA

Data set 06

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Plate Voltage
100 V
Plate Current
14 mA
Transconductance
6500 uS
Amplification Factor
32 ratio
Maximum Intended Frequency
220 MHz
FrequencyChanger

SECTION 2

Pentode

Characteristics

Plate Voltage
170 V
Screen Voltage
170 V
Plate Current
10 mA
Screen Current
2.8 mA
Transconductance
7500 uS

Data set 07

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Plate Current
13.5 mA
Triode;PlateVoltage=125V

SECTION 2

Pentode

Characteristic

Plate Current
9.5 mA
Pentode;PlateVoltage=125V

Data set 08

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater/filament voltage
6.3 V
Published rating
Heater/filament current
450 mA
Published rating
Pentode transconductance
4000 µS
PentodeSection
Triode amplification factor
40
TriodeSection

Other

Pentode plate voltage
300 V
PentodeSection
Pentode plate current
10 mA
PentodeSection
Pentode control-grid bias
-0.7 V
PentodeSection
Pentode screen current
3.5 mA
PentodeSection
Triode plate voltage
150 V
TriodeSection
Triode control-grid bias
-1 V
TriodeSection
Triode plate current
18 mA
TriodeSection

Data set 09

1963 Mullard

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Triode plate voltage
150 V
Section2
Triode plate current
18 mA
Section2
Triode control-grid voltage
-1 V
Section2
Triode transconductance
8500 uS
Section2
Triode amplification factor
40 ratio
Section2
Triode plate resistance
5000 Ohm
Section2

SECTION 2

Pentode

Characteristics

Pentode plate voltage
250 V
Section1
Pentode screen-grid voltage
110 V
Section1
Pentode plate current
10 mA
Section1
Pentode screen-grid current
3.5 mA
Section1
Pentode control-grid voltage
-0.9 V
Section1
Pentode transconductance
5200 uS
Section1
Pentode plate resistance
400000 Ohm
Section1
Pentode screen-to-control-grid amplification factor
35 ratio
Section1

Other

Conversion conductance
1650 uS
FrequencyChanger;Va=170V
Conversion conductance
1800 uS
FrequencyChanger;Va=200V
Conversion conductance
1900 uS
FrequencyChanger;Va=250V

Data set 10

1965 Sylvania Electronic Tubes Vol3

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater Voltage
6.3 V
Heater Current
450 mA
Grid To Plate Capacitance
1.8 pF
Input Capacitance
2.8 pF
Output Capacitance
2 pF
Transconductance
7500 uS
Amplification Factor
60

Other

Plate Supply Voltage
125 V
TriodeUnit
Plate Current
13.5 mA
TriodeUnit

SECTION 2

Pentode

Characteristic

GridToPlateCapacitanceMaximum
0.015 pF
Input Capacitance
5 pF
Output Capacitance
3.5 pF
Plate Resistance
200000 ohm
Transconductance
5000 uS

Other

Plate Supply Voltage
125 V
PentodeUnit
Screen Voltage
110 V
PentodeUnit
Plate Current
9.5 mA
PentodeUnit
Screen Current
3.5 mA
PentodeUnit

Data set 11

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Plate voltage
125 V
ClassA
Grid #1 voltage
-1 V
ClassA
Plate current
13.5 mA
ClassA
Heater warm-up time
11 s
BothSections

Characteristic

Transconductance
7500 uS
Amplification factor
40

Capacitance

Grid-to-plate capacitance
1.5 pF
Input capacitance
2.8 pF
Output capacitance
1.5 pF

SECTION 2

Pentode

Other

Plate voltage
125 V
ClassA
Grid #2 voltage
110 V
ClassA
Grid #1 voltage
-1 V
ClassA
Plate current
9.5 mA
ClassA
Grid #2 current
3.5 mA
ClassA

Characteristic

Transconductance
5000 uS
Zero-bias transconductance
5500 uS
Eb=100V;Ec2=70V

Capacitance

Grid-to-plate capacitance
0.02 pF
Input capacitance
5.5 pF
Output capacitance
2.6 pF

Data set 12

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Tension filAMEnt …….……ccresrsrsecssocressomcrsessesenseenseceseossececsaeceness VÊ
6.3 V
Heater current …..…..….….……msses If
450 mA
Tension d'AnOdE …….……srereseenesenessenmnnens Vä 300
300 V
Tension de grille n° Z ……...uerserecrnvereseesceuues… VE
300 V
Puissance appliquée à 1a gnlle n° 2 …. PgnN
0.5 W
Tension entre filament et cathode …………..…….. VfK 90
90 V
TeEnsion d'AnOdE ….……cerrreresssesensemreesenensu… VA 150
250 V
Screen-grid voltage …. Veg,
110 V
Plate current …… …… Ia 18
10 mA
Courant de grille n° 2 …… Ig2
3.5 mA
envacorrenserase aneonesmeenesecueuse SS 8,5
5.2 mA
RÉSISTANCE INtErNE …….………cercencsesaemncsenssseeuces P 5
400 kΩ
=10 ;LA) …… -Vgbl -12
-10 V

Characteristic

Capacitance grille/anode …… Ce/a 1,8
1.8 pF
InterelectrodeCapacitance
Capacitance d'entrée . Ce 2,5
2.5 pF
InterelectrodeCapacitance
Capacitance de soiîtie …. …… Cs 1,0
0.4 pF
InterelectrodeCapacitance
Capacitance grille n° 1/anode …. Cg,/a 0,006
0.01 pF
InterelectrodeCapacitance
Capacitance d'entrée …… Ce 5
5 pF
InterelectrodeCapacitance
Capacitance de sortie …… CS 3,5
2.6 pF
InterelectrodeCapacitance