Data set 01
1958 Brimar Radio Valve No 7
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Heater Voltage
12.6 V
Heater Current
150 mA
Voltage Pentode - Sharp Cutoff (single) ·Pentode
12AU6
Sharp-cutoff voltage pentode designed for RF amplification with a series heater. Its abrupt cutoff characteristic suits fixed-gain high-frequency signal stages rather than automatic-gain-controlled remote-cutoff service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 7BK
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 12.6 V / 150 mA
Description
Sharp-cutoff voltage pentode for RF amplification with series heater.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 7BK
- 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
7BK - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN1G1 | A | G1 — Control Grid EIA chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BK |
| PIN2G3 | A | G3 — Suppressor GridGroup 7BK2 EIA chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BK |
| PIN2IS | A | IS — Internal ScreenGroup 7BK2 EIA chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BK |
| PIN3H | — | H — Heater EIA chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BK |
| PIN4H | — | H — Heater EIA chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BK |
| PIN5P | A | P — Plate (Anode) EIA chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BK |
| PIN6G2 | A | G2 — Screen Grid EIA chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BK |
| PIN7K | A | K — Cathode EIA chart transcription; independent manufacturer confirmation pending | Unverified EIA Base Connections, printed page 128, 7BK |
Section ratings
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 500000 Ω
- Transconductance
- 0.0029 S
- Amplification factor
- 36
- Max plate voltage
- 250 V
- Max screen voltage
- 200 V
- Max plate dissipation
- 2.5 W
- Max screen dissipation
- 0.75 W
Published promoted fields populated semantically; identical repeated sections compressed.
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
Pentode
Characteristic
Transconductance
5200 uS
PlateVoltage=250V;ScreenVoltage=150V
TriodeConnectionAmplificationFactor
36
TriodeConnection
Data set 03
1965 Sylvania Electronic Tubes Vol3
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Plate voltage
250 V
PentodeConnection
Screen-grid voltage
125 V
PentodeConnection
Cathode resistor
100 Ohm
PentodeConnection
Transconductance
4500 uS
PentodeConnection
Plate resistance
1500000 Ohm
PentodeConnection
Plate current
7.6 mA
PentodeConnection
Screen-grid current
3 mA
PentodeConnection
Triode-connected plate voltage
250 V
TriodeConnection
Triode-connected amplification factor
36 ratio
TriodeConnection
Triode-connected plate resistance
7500 Ohm
TriodeConnection
Capacitance
Grid-to-plate capacitance
0.0035 pF
PentodeConnection
Input capacitance
5.5 pF
PentodeConnection
Output capacitance
5 pF
PentodeConnection
Data set 04
1965 Westinghouse Data Book
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Heater Voltage
12.6 V
Heater Current
150 mA
GridToPlateCapacitanceMaximum
0.0035 pF
Input Capacitance
5.5 pF
Output Capacitance
5 pF
Plate Voltage
250 V
Screen Voltage
150 V
Cathode Resistance
68 ohm
Transconductance
5200 uS
Plate Resistance
1000000 ohm
Plate Current
10.6 mA
Screen Current
4.3 mA
TriodeConnectedAmplificationFactor
36
TriodeConnectedPlateResistance
7500 ohm
TriodeConnectedTransconductance
4800 uS
Data set 05
1966 Tung Sol Electronic Tubes 2 of 4
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Plate voltage
250 V
ClassA;PentodeConnection
Grid #2 voltage
150 V
ClassA;PentodeConnection
Plate current
10.5 mA
ClassA;PentodeConnection
Grid #2 current
3.5 mA
ClassA;PentodeConnection
Characteristic
Plate resistance
500000 ohm
ClassA;PentodeConnection
Transconductance
5200 uS
ClassA;PentodeConnection
Triode-connected transconductance
4800 uS
TriodeConnection
Triode-connected amplification factor
19
TriodeConnection
Capacitance
Grid-to-plate capacitance
0.0035 pF
Input capacitance
5.5 pF
Output capacitance
5 pF
Data set 06
1971 RCA HB3 Binder 5 of 7
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Heater voltage nominal
12.6 V
Heater current
150 mA
Data set 07
1975 RCA RC30
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
Heater Voltage (ac/dc)
12.6 volts
Published value from supplied target entry
Heater Current
0.15 ampere
Published value from supplied target entry
Plate Voltage
330 volts
Published value from supplied target entry
Grid-No
3
Published value from supplied target entry
Grid-No
2
Published value from supplied target entry
Grid-No
2
Published value from supplied target entry
Grid-No
1
Published value from supplied target entry
Plate Dissipation
3.5 watts
Published value from supplied target entry
Grid-No
2
Published value from supplied target entry
For grid-No
165 volts
Published value from supplied target entry
For grid-No
330 volts
Published value from supplied target entry
Plate Supply Voltage
150
Published value from supplied target entry
Grid-No
150 volts
Published value from supplied target entry
Amplification Factor
36
Published value from supplied target entry
Plate Resistance (Approx.)
1 megohms
Published value from supplied target entry
Transconductance
5200
Published value from supplied target entry
Plate Current
10.6 mA
Published value from supplied target entry
Grid-No
2
Published value from supplied target entry
Capacitance
Plate to Cathode, Heater, Grid No
3
Published value from supplied target entry