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Voltage Radio Detector Converter ·Heptode

12BE6

Heptode oscillator-converter for AC/DC superheterodyne receivers. It integrates local-oscillator and mixer functions in one miniature tube, converting incoming RF signals to the receiver intermediate frequency.

Directly heatedCold cathodeCommon cathodeDissimilar

Sections: 1
Base: 7CH
Socket code: B7G
Base pins: 7
Nominal heater: 12.6 V / 150 mA

Description

Heptode frequency converter for series-heater receivers.

Socket description

Miniature 7-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: 7CH
Socket code: B7G
Base pins: 7
Nominal heater voltage: 12.6 V
Nominal heater current: 150 mA
Parallel heater voltage: -
Parallel heater current: -
Series capable: No

7CH - Terminal pinout

Electrical assignments shared by every tube using this base designation.

Terminal	Section	Connection	Evidence
PIN1G1	A	G1 — Control Grid Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN2G5	A	G5 — Fifth GridGroup 7CH2 Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN2K	A	K — CathodeGroup 7CH2 Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN3H	—	H — Heater Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN4H	—	H — Heater Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN5P	A	P — Plate (Anode) Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN6G2	A	G2 — Screen GridGroup 7CH6 Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN6G4	A	G4 — Fourth GridGroup 7CH6 Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH
PIN7G3	A	G3 — Suppressor Grid Chart transcription; independent manufacturer verification pending	Unverified EIA Base Connections, printed page 128, 7CH

Section ratings

1 physical section, each with unique specifications.

Section 1

Heptode

X-ray radiationInterelectrode capacitances

Plate resistance: 1000000 Ω
Transconductance: 0.000475 S
Amplification factor: 1
Max plate voltage: 300 V
Max screen voltage: 100 V
Max plate dissipation: 1 W
Max screen dissipation: 1 W
Max cathode current: 14 mA

Published converter characteristic is conversion transconductance, preserved as a parameter rather than promoted as generic transconductance.

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

1958 Brimar Radio Valve No 7

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

Heater Voltage
12.6 V
Heater Current
150 mA

Data set 02

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Heater voltage
12.6 V
Nominal
Heater current
150 mA
Nominal
Plate voltage
330 V
Typical operating conditions
Plate current
2.62.9 mA
Typical operating conditions

Data set 03

1965 Westinghouse Data Book

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

Heater Voltage
12.6 V
Heater Current
150 mA
Oscillator Plate Voltage
100 V
Oscillator Cathode Current
25 mA

Other

Plate Voltage Maximum
300 V
Grids2And4VoltageMaximum
150 V
Plate Dissipation Maximum
1 W
Grids2And4DissipationMaximum
1 W
NegativeGridBiasMagnitudeMaximum
50 V
Plate Voltage
250 V
Converter
Grids2 And4 Voltage
100 V
Converter
Plate Current
3 mA
Converter
Grids2 And4 Current
6.5 mA
Converter
Conversion Transconductance
475 uS
Converter

Data set 04

1966 Tung Sol Electronic Tubes 2 of 4

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

HEATER VOLTAGE
12.6 V
Published datasheet; operating column 1
HEATER VOLTAGE
10 V
Published datasheet; operating column 2
HEATER CURRENT
150 mA
Published datasheet
PLATE VOLTAGE
100 V
Published datasheet; operating column 1
PLATE VOLTAGE
250 V
Published datasheet; operating column 2
GRID #3 VOLTAGE
-1.5 V
Published datasheet; operating column 1
GRIDS #2, AND #4 VOLTAGE
100 V
Published datasheet
GRID #! VOLTAGE (
0 V
Published datasheet; operating column 1
GRID #! VOLTAGE (
10 V
Published datasheet; operating column 2

Other

HEATER POSITIVE WITH RESPECT TO CATHODE
200 V
Published datasheet
J MAXIMUM PLATE VOLTAGE
330 V
Published datasheet
MAXIMUM GRIDS #2 AND #4 VOLTAGE
110 V
Published datasheet
MAXIMUM GRIDS #2 AND #4 SUPPLY VOLTAGE
330 V
Published datasheet
! MAXIMUM NEGATIVE DC GRID #3 VOLTAGE
-55 V
Published datasheet
MAXIMUM POSITIVE DC GRID #3 VOLTAGE
0 V
Published datasheet
MAXIMUM PLATE DISSIPATION
1.1 W
Published datasheet
MAXIMUM GRIDS #2 AND #4 DISSIPATION
1.1 W
Published datasheet
MAXIMUM CATHODE CURRENT
15.5 mA
Published datasheet
C THE DC COMPONENT MUST NOT EXCEED
100 V
Published datasheet
GRID #1 RESISTANCE (
0 ohm
Published datasheet; operating column 1

Data set 05

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Screen Supply Voltage
300 V
Plate Voltage
100 V
ConverterService; PlateVoltage=100V; ScreenVoltage=100V
Screen Voltage
100 V
ConverterService; PlateVoltage=100V; ScreenVoltage=100V
Grid3 Voltage
-1.5 V
ConverterService; PlateVoltage=100V; ScreenVoltage=100V
Grid1VoltageRMS
10 V
ConverterService; PlateVoltage=100V; ScreenVoltage=100V
Grid1 Resistance
20000 ohm
ConverterService; PlateVoltage=100V; ScreenVoltage=100V
Plate Voltage
250 V
ConverterService; PlateVoltage=250V; ScreenVoltage=100V
Screen Voltage
100 V
ConverterService; PlateVoltage=250V; ScreenVoltage=100V
Grid3 Voltage
-1.5 V
ConverterService; PlateVoltage=250V; ScreenVoltage=100V
Grid1VoltageRMS
10 V
ConverterService; PlateVoltage=250V; ScreenVoltage=100V
Grid1 Resistance
20000 ohm
ConverterService; PlateVoltage=250V; ScreenVoltage=100V

Characteristic

Plate Resistance
400000 ohm
ConverterService; PlateVoltage=100V; ScreenVoltage=100V
Conversion Transconductance
455 uS
ConverterService; PlateVoltage=100V; ScreenVoltage=100V
Plate Current
2.6 mA
ConverterService; PlateVoltage=100V; ScreenVoltage=100V
Screen Current
7 mA
ConverterService; PlateVoltage=100V; ScreenVoltage=100V
Cathode Current
10.1 mA
ConverterService; PlateVoltage=100V; ScreenVoltage=100V
Plate Resistance
1000000 ohm
ConverterService; PlateVoltage=250V; ScreenVoltage=100V
Conversion Transconductance
475 uS
ConverterService; PlateVoltage=250V; ScreenVoltage=100V
Plate Current
2.9 mA
ConverterService; PlateVoltage=250V; ScreenVoltage=100V
Screen Current
6.8 mA
ConverterService; PlateVoltage=250V; ScreenVoltage=100V

Data set 06

1968 Mazda Belvu

Published operating points and test conditions from this source.

SECTION 1

Heptode

Application

Application
FrequencyConverter text

Data set 07

1971 RCA HB3 Binder 5 of 7

Published operating points and test conditions from this source.

SECTION 1

Heptode

Other

Voltage (AC or DC) ± %
63 V
PublishedColumn1
Voltage (AC or DC) ± %
10 V
PublishedColumn2
Current at
6.3 V
PLATE VOLTAGE max
330 V
Negative-bias value max
55 V
Positive-bias value max
0 V
SUPPLY VOLTAGE max
330 V
GRIDS-No. d No. VOLTAGE max
4 V
PublishedColumn1

Capacitance

trodes IRF input)
7 pF
PublishedColumn1
(Mixer input)
8 pF
PublishedColumn1
(Mixer input)
13 pF
PublishedColumn2
trodes (Osci llator input)
5.5 pF
PublishedColumn1
Grid No. to plate max. max
3 pF
PublishedColumn1
Grid No. to plate max. max
0.25 pF
PublishedColumn2
Grid No. to grid No max. max
0.15 pF
PublishedColumn1
Grid No. to plate. max. max
0.1 pF
PublishedColumn1
Grid No. to plate. max. max
0.05 pF
PublishedColumn2
Grid No.l to cathode &grid No.S
3 pF
PublishedColumn1
electrodes except grid No.l
15 pF
PublishedColumn1
electrodes except grid No.l
20 pF
PublishedColumn2

Data set 08

1975 RCA RC30

Published operating points and test conditions from this source.

SECTION 1

Heptode

Characteristic

Plate Dissipation
6.6 watts
Published value from supplied target entry
Tube Voltage Drop for dc plate current of
26 mA
Published value from supplied target entry
Heater Voltage (ac/dc)
12.6 volts
Published value from supplied target entry
Heater Current
0.16 ampere
Published value from supplied target entry
Plate Voltage
330 volts
Published value from supplied target entry
Grids-No
110 volts
Published value from supplied target entry
Grids-No
330 volts
Published value from supplied target entry
Cathode Current
15.5 mA
Published value from supplied target entry
Plate Dissipation
1.1 watts
Published value from supplied target entry
Grid-No
3
Published value from supplied target entry
Plate Voltage
250 volts
Published value from supplied target entry
Grids-No
100 volts
Published value from supplied target entry
Grid-No.l (Oscillator-Grid) Voltage (rms)
10 volts
Published value from supplied target entry
Grid-No
-1.5 volts
Published value from supplied target entry
Grid-No.l (Oscillator-Grid) Resistor
20000 ohms
Published value from supplied target entry
Plate Resistance (Approx.)
1 megohm
Published value from supplied target entry
Conversion Transconductance
475
Published value from supplied target entry
Plate Current
2.9 mA
Published value from supplied target entry

Capacitance

Plate to All Other Electrodes *
13 pF
Published value from supplied target entry