Data set 01
195X Tesla
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
HeaterVoltageNominal
2.8 V
Nominal
HeaterCurrentNominal
50 mA
Nominal
Maximum Plate Voltage
150 V
Maximum Plate Dissipation
2 W
Power - Pentode Single (NOT beam) (under 10W) ·Pentode
3L31
Output pentode designed for both Class-A audio and RF power amplification. Manufacturer documentation identifies genuine output-stage service across low-frequency and radio-frequency applications.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- B7G
- Base pins
- 7
- Nominal heater
- 2.8 V / 50 mA
Description
Output pentode for Class A audio and RF power amplification.
Socket description
Miniature 7-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B7G
- Base pins
- 7
- Nominal heater voltage
- 2.8 V
- Nominal heater current
- 50 mA
- Parallel heater voltage
- 1.4 V
- Parallel heater current
- 100 mA
- Series capable
- Yes
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
Pentode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0021 S
- Max plate voltage
- 150 V
- Max screen voltage
- 90 V
- Max plate dissipation
- 2 W
- Max screen dissipation
- 0.4 W
Published ratings/characteristics promoted from the approved source.
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
1969 Tesla Manual of Electronic Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Other
Power Output
0.7 W
ClassA;OneTube