Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Plate Current
8 mA
PlateVoltage=100V; CathodeBiasResistor=100ohm
Voltage - Dual Triode (similar) ·Triode-Triode
6BF7A
Improved subminiature medium-mu twin triode for Class-A amplifier service, specifically constructed for equipment subject to severe shock and vibration.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- 8DG
- Socket code
- SUBMINIATURE8
- Base pins
- 8
- Nominal heater
- 6.3 V / 300 mA
Description
Subminiature medium-mu double triode for severe shock and vibration service.
Socket description
Subminiature 8-lead base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 8DG
- Socket code
- SUBMINIATURE8
- Base pins
- 8
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 300 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
8DG - Terminal pinout
Electrical assignments shared by every tube using this base designation.
| Terminal | Section | Connection | Evidence |
|---|---|---|---|
| PIN12P | B | P — Plate (Anode) EIA source transcription; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DG |
| PIN22G1 | B | G1 — Control Grid Original EIA label 2G1; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DG |
| PIN3H | — | H — Heater Original EIA label H; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DG |
| PIN42K | B | K — Cathode Original EIA label 2K; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DG |
| PIN51K | A | K — Cathode Original EIA label 1K; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DG |
| PIN6H | — | H — Heater Original EIA label H; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DG |
| PIN71G1 | A | G1 — Control Grid Original EIA label 1G1; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DG |
| PIN81P | A | P — Plate (Anode) Original EIA label 1P; manufacturer confirmation pending | Unverified EIA Base Connections, printed page 129, 8DG |
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 7300 Ω
- Transconductance
- 0.0048 S
- Amplification factor
- 35
- Max plate voltage
- 120 V
- Max plate dissipation
- 1.1 W
Improved medium-mu twin triode for Class-A amplifier service.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 7300 Ω
- Transconductance
- 0.0048 S
- Amplification factor
- 35
- Max plate voltage
- 120 V
- Max plate dissipation
- 1.1 W
Physical triode restored under current one-row-per-physical-section policy.
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
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
Plate voltage
100 V
ClassA; OperatingPoint1
Cathode resistor
100 ohm
ClassA; OperatingPoint1
Plate current
8 mA
ClassA; OperatingPoint1
Plate resistance
7300 ohm
ClassA; OperatingPoint1
Transconductance
4800 uS
ClassA; OperatingPoint1
Amplification factor
35
ClassA; OperatingPoint1
Characteristics
Input capacitance
2 pF
Output capacitance
1.6 pF
Section1
Grid-to-plate capacitance
1.5 pF