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
Voltage Pentode or Tetrode (under 100V) ·Heptode
12AD6
Miniature heptode frequency changer developed specifically for automobile radios operating directly from a 12 V battery. It performs oscillator and mixer functions effectively without a conventional high-voltage B-plus supply.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 7CH
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 12.6 V / 150 mA
Description
The 12AD6 is a pentagrid converter intended as a combined oscillator and mixer in superheterodyne receivers using a nominal 12-volt automotive battery supply.
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
- Amplification factor
- 9.4
- Max plate voltage
- 30 V
- Max screen voltage
- 30 V
- Max cathode current
- 20 mA
Published converter transconductance is conversion transconductance, so it is not 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 02
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Heptode
Characteristic
Conversion Transconductance
320 uS
Converter;SeparateExcitation
Oscillator Transconductance
3600 uS
NotOscillating
Oscillator Amplification Factor
9.4
NotOscillating
Connected To Plate
3600 uS
Cathode Current
4.5 mA
E, =
12.6 V
B, =
12.6 V
Feyg =
12.6 V
Ef =
12.6 V
Rg, =
33 ohm
Z{” =
200 ohm
Grid #
3 V
Other
Heater Operating Voltage Minimum
10 V
PublishedRange
Heater Operating Voltage Maximum
15.9 V
PublishedRange
Plate Voltage —
16 V
Cathode Current
20 mA
Capacitance
Mixer Grid to Plate
0.3 pF
RF Input Capacitance
7 pF
Oscillator Input Capacitance
3.2 pF
Mixer Output Capacitance
7 pF
Oscillator Output Capacitance
11 pF
Data set 03
1966 Tung Sol Electronic Tubes 2 of 4
Published operating points and test conditions from this source.
SECTION 1
Heptode
Other
Plate voltage
12.6 V
Converter;SeparateExcitation
Grid 2 and 4 voltage
12.6 V
Converter;SeparateExcitation
Grid 1 drive peak-to-peak
4.5 V
Converter;SeparateExcitation
Characteristic
Plate resistance
0.4 Mohm
Converter;SeparateExcitation
Conversion transconductance
320 µS
Converter;SeparateExcitation
Plate current
0.35 mA
Converter;SeparateExcitation
Cathode current
2.6 mA
Converter;SeparateExcitation
Oscillator transconductance
3600 µS
Oscillator;NotOscillating
Oscillator amplification factor
9.4
Oscillator;NotOscillating
Oscillator cathode current
4.5 mA
Oscillator;NotOscillating
Data set 04
1968 General Electric Co
Published operating points and test conditions from this source.
SECTION 1
Heptode
Other
Plate Voltage
30 V
Plate Voltage
12 V
Plate Voltage
12.6 V
Screen Voltage
12 V
Screen Voltage
12 V
Plate Current
0.45 mA
Screen Current
4 mA
Transconductance
260 uS
Transconductance
3800 uS
Amplification Factor
9
Plate Resistance
1 ohm
Plate Voltage
12.6 V
ConverterService
Screen Voltage
12.6 V
ConverterService
Characteristic
Conversion Transconductance
260 uS
ConverterService
Plate Current
0.45 mA
ConverterService
Screen Current
1.5 mA
ConverterService
Oscillator Amplification Factor
9
OscillatorNotOscillating
Oscillator Transconductance
3800 uS
OscillatorNotOscillating
Cathode Current
5 mA
OscillatorNotOscillating