Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Triode
Other
HeaterVoltageNominal
7 V
Nominal
HeaterCurrentNominal
320 mA
Nominal
Plate Voltage
250 V
ClassA
Voltage - Triode (single) ·Triode
7B4
General-purpose triode for amplification or electronic service as documented by the manufacturer.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- 5AC
- Socket code
- LOCTAL8
- Base pins
- 8
- Nominal heater
- 7 V / 320 mA
Description
A single-ended high-mu Lock-In triode with characteristics and applications similar to the 6SF5GT.
Socket description
Loctal 8-contact base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- 5AC
- Socket code
- LOCTAL8
- Base pins
- 8
- Nominal heater voltage
- 7 V
- Nominal heater current
- 320 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
5AC - Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
1 physical section, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 66000 Ω
- Transconductance
- 0.0015 S
- Amplification factor
- 100
- Max plate voltage
- 200 V
Published promoted fields populated by semantic heading; identical repeated physical 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
195X General Electric Essential Characteristics
Published operating points and test conditions from this source.
SECTION 1
Triode
Capacitance
Input capacitance
3.6 pF
Section1
Output capacitance
3.4 pF
Section1
Grid-to-plate capacitance
1.6 pF
Section1
Other
Typical plate voltage
250 V
ClassA
Typical grid voltage
-2 V
ClassA
Typical plate current
0.9 mA
ClassA
Characteristic
Plate resistance
66000 Ohm
Section1
Transconductance
1500 uS
Section1
Amplification factor
100
Section1
Data set 03
1961 Tung Sol
Published operating points and test conditions from this source.
SECTION 1
Triode
Capacitance
Grid To Plate Capacitance
1.6 pF
Input Capacitance
3.6 pF
Output Capacitance
3.4 pF