Data set 01
1950 Sylvania
Published operating points and test conditions from this source.
SECTION 1
Triode
Characteristic
Transconductance
12500 µS
Amplification Factor
33
Other
Maximum Plate Voltage
200 V
Plate Voltage
90 V
ClassC
Power - Triode ·Triode-Triode
8431
Medium-mu double triode designed for continuous Class-C RF amplifier service around 200 MHz, intended for sustained high-frequency power amplification.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 2
- Base
- -
- Socket code
- B9A
- Base pins
- -
- Nominal heater
- 12.6 V / 180 mA
Description
Medium-mu double triode designed for continuous Class-C amplifier service around 200 MHz.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B9A
- Base pins
- -
- Nominal heater voltage
- 12.6 V
- Nominal heater current
- 180 mA
- Parallel heater voltage
- -
- Parallel heater current
- -
- Series capable
- No
Terminal pinout
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
Section ratings
2 physical sections, each with unique specifications.
Section 1
Triode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0125 S
- Amplification factor
- 33
- Max plate voltage
- 200 V
Published maximum ratings and characteristics promoted semantically from the approved source.
Section 2
Triode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0125 S
- Amplification factor
- 33
- Max plate voltage
- 200 V
Second physical triode section; added to align rows with SectionCount.
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.