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Voltage - Triode (with diode, heptode or hexode) ·Hexode-Triode

ECH81

Widely used triode-heptode frequency changer for AM and FM receivers. The triode normally serves as local oscillator while the heptode performs mixing and conversion with good circuit isolation.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 2
Base: B9A
Socket code: B9A
Base pins: 9
Nominal heater: 6.3 V / 300 mA

Description

Triode-heptode for oscillator and frequency-converter service in radio 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: B9A
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

B9A - Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

2 physical sections, each with unique specifications.

Section 1

Triode

X-ray radiationInterelectrode capacitances

Plate resistance: 19000 Ω
Transconductance: 0.0038 S
Amplification factor: 22
Max plate voltage: 250 V
Max plate dissipation: 0.8 W
Max cathode current: 6.5 mA

Published maximum ratings/characteristics promoted from source.

Section 2

Hexode

X-ray radiationInterelectrode capacitances

Plate resistance: 3000000 Ω
Transconductance: 0.000775 S
Amplification factor: 25
Max plate voltage: 250 V
Max screen voltage: 100 V
Max plate dissipation: 2 W
Max screen dissipation: 1 W
Max cathode current: 12.5 mA

Published maximum ratings/characteristics promoted from 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

1953 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Chauffage : Indirect (cathode isolee du filament). vf
63 V
Triode
Alimentation du filament en serie ou en parallele. If
300 mA
Triode

Other

Tension de l'anode
100 V
Triode
Tension de la grille
2 V
Triode
Courant anodique
73 mA
Triode
Tension de l'anode
250 V
Triode
Puissance dissipee sur l'anode
8 W
Triode
Resistance du circuit de grille
3 Mohm
Triode
Courant cathodique
6.5 mA
Triode
Tension entre filament et cathode. Vkf
100 V
Triode

Capacitance

00es Cor
42 pF
Triode
Capacite de l'anode
3.9 pF
Triode
Capacite anode-grille
0 a
Triode
00 Caror
1 pF
Triode
Capacite d'entree de l'heptode
68 pF
Triode

SECTION 2

Hexode

Other

Haute tension
250 V
Heptode
Resistance du circuit de lagrille3
47 kohm
Heptode
Tension de la grille 4
29 V
Heptode
Tension des grilles 2 et 4
250 V
Heptode
Resistance interne
3 Mohm
Heptode
Capacite de la grille 1
62 pF
Heptode
Capacite de la grille 3
5.2 pF
Heptode
Capacite anode-grille 14.11.02s cnc en n Caug, < 0,01 pF
0.01 pF
Heptode
Tension des grilles 2 et 4
125 V
Heptode
Tension des grilles 2 et 4 (l[a < 1mA) Vg (a+ 00
300 V
Heptode
Courant cathodique
12.5 mA
Heptode

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
300 mA
Nominal
Maximum Plate Voltage
250 V
Maximum Plate Dissipation
1.5 W
Maximum Cathode Current
15 mA

Characteristic

Transconductance
3800 µS
Typical
Amplification Factor
22
Typical
Plate Resistance
19000 ohm
Typical

SECTION 2

Hexode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Screen Voltage
250 V
Maximum Plate Dissipation
1.5 W
Maximum Screen Dissipation
1 W
Maximum Cathode Current
25 mA

Characteristic

Transconductance
775 µS
Typical
Plate Resistance
1000000 ohm
Typical

Data set 03

1955 Marconi

Published operating points and test conditions from this source.

SECTION 1

Triode

Application

Oscillator section function
Local oscillator

Other

Oscillator anode voltage
250 V

SECTION 2

Hexode

Construction

Mixer section identity
Heptode

Other

Mixer anode voltage
250 V
Mixer screen voltage
100 V

Application

Frequency-changer service
Explicit

Data set 04

195X Tesla

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Voltage
250 V
Maximum Plate Dissipation
1.5 W

Characteristic

Transconductance
3800 µS
Typical
Amplification Factor
22
Typical

SECTION 2

Hexode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Voltage
300 V
Maximum Screen Voltage
100 V

Data set 05

1961 Ferranti Technical Handbook

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater Voltage
6.3 V
Heater Current
300 mA

SECTION 2

Hexode

Characteristic

Application
Frequency changer RF or IF amplifier

Data set 06

1963 Amperex Condensed

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Typical plate voltage
250 V
Section1
Typical grid voltage
0 V
Section1
Typical plate current
13.5 mA
Section1

Characteristic

Amplification factor
22
Section1
Plate resistance
33 kOhm
Section1
Transconductance
2400 uS
Section1

SECTION 2

Hexode

Other

Typical plate voltage
250 V
Section2
Typical screen voltage
100 V
Section2
Typical control-grid voltage
-2 V
Section2
Typical plate current
6.5 mA
Section2
Typical screen current
3.8 mA
Section2

Characteristic

Transconductance
650 uS
Section2

Data set 07

1963 Philips Electron Tubes Handbook V1a

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Heater voltage
6.3 V
Published heater rating
Heater current
300 mA
Published heater rating
Triode transconductance
3700 µS
TriodeSection
Triode amplification factor
22
TriodeSection
Conversion transconductance
650 µS
Converter

Other

Triode plate voltage
100 V
TriodeSection
Triode plate current
13.5 mA
TriodeSection
Oscillator triode plate current
4.5 mA
TriodeSection Oscillator

Data set 08

1967 Mullard Receiving Tubes for Maintenance

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Plate voltage
100 V
Plate current
13.5 mA
Grid voltage
0 V
Transconductance
3.7 mA/V
Amplification factor
22
Plate resistance
6 kOhm

Other

Supply voltage
250 V
RFOscillator
Oscillator plate current
4.5 mA
RFOscillator
Effective transconductance
650 uA/V
RFOscillator
Maximum plate voltage
250 V
Maximum plate dissipation
0.8 W
Maximum cathode current
6.5 mA

SECTION 2

Hexode

Characteristic

Plate voltage
160 V
Screen-grid voltage
100 V
Control-grid voltage
-0.5 V
Plate current
11 mA
Screen-grid current
7 mA
Transconductance
4.5 mA/V

Other

Maximum plate voltage
300 V
Maximum plate dissipation
2 W
Maximum screen-grid voltage
125 V
Maximum screen-grid dissipation
0.8 W
Maximum cathode current
18 mA

Data set 09

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristics

Heater voltage
6.3 V
Published nominal value
Heater current
300 mA
Published nominal value

Other

Maximum plate dissipation
0.8 W
Published maximum rating

SECTION 2

Hexode

Characteristics

Heater voltage
6.3 V
Published nominal value
Heater current
300 mA
Published nominal value

Other

Maximum plate dissipation
2 W
Published maximum rating
Application
Oscillator-frequency converter
Printed source application

Data set 10

1972 Philips Receiving Tubes

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Voltage
550 V
Maximum Plate Dissipation
0.8 W
Maximum Cathode Current
15 mA

Characteristic

Transconductance
3700 µS
Typical
Amplification Factor
22
Typical
Plate Resistance
6000 ohm
Typical

SECTION 2

Hexode

Other

HeaterVoltageNominal
6.3 V
Nominal
HeaterCurrentNominal
300 mA
Nominal
Maximum Plate Voltage
550 V
Maximum Screen Voltage
250 V
Maximum Plate Dissipation
2 W
Maximum Screen Dissipation
0.8 W
Maximum Cathode Current
25 mA

Characteristic

Transconductance
4500 µS
Typical
Amplification Factor
25
Typical
Plate Resistance
800000 ohm
Typical

Data set 11

1973 Mazda Valves Binder 2

Published operating points and test conditions from this source.

SECTION 1

Triode

Other

Heater Voltage Vi,
63 V
Heater Current Ih
3 A
Maximum Anode Dissipation pa(max) 08
17 W
Maximum Screen Grids Dissipation pB2 +$4( max ) —
1 W
Maximum Anode Voltage Va(max) 250
300 V
Maximum Screen Grids Voltage V$2 +84( max) —
125 V
Maximum Screen Grids Voltage (l a <1mA) —
300 V
Maximum Mean Cathode Current Ik(av)max 65
125 mA

Characteristic

Output Cout 21
79 pF
Input (g1) Cin(g1) 26
48 pF
Input (g3) Ci^(ga) —
6 pF
Grid 1 to Anode Cg1-a 1 <
6 pF
Grid 1 to Grid 3 cg1-g3 — <
3 pF
Grid 1 to Grid 3, Grid Triode agl-g3gt <
45 pF
Grid 1 to Grid Triode Cgl-gt <
17 pF

Data set 12

1999 Philips E-Z

Published operating points and test conditions from this source.

SECTION 1

Triode

Characteristic

Anode current 1y
13.5 mA
Published datasheet value
Transconductance S
3.7 mA/V
Published datasheet value
Anode current Iy
11 mA
Published datasheet value
Transconductance S
4.5 mA/V
Published datasheet value
Heater voltage Vs
6.3 V
Published datasheet value
Heater current Ig
300 mA
Published datasheet value

Capacitance

Grid to all except anode Cg(a)
2.6 pF
Published datasheet value
Anode to all except grid Ca(g)
2.1 pF
Published datasheet value
Anode to grid Cag
1 pF
Published datasheet value
Grid to heater Cgf max
0.02 pF
Published datasheet value
Grid No.1 to all except anode Cgl(a)
4.8 pF
Published datasheet value
Anode to all except grid No.l Ca(gl)
7.9 pF
Published datasheet value
Anode to grid No.1 Cag
1 ma
Published datasheet value
Grid No.l to heater Cglf max
0.17 pF
Published datasheet value
Grid No.3 to all Cgs
6 pF
Published datasheet value