Data set 01
1956 Western Electric Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Application
Tube service
Transmitting tube
Other
Typical Class-B RF power output
30 W
ClassB
Power - Pentode (NOT beam) ·Pentode
339A
Western Electric air-cooled transmitting pentode designed for Class-B RF power service. Its defining role is radio-frequency power amplification in transmitting equipment rather than receiver audio output.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- SMALL5
- Base pins
- 5
- Nominal heater
- 6 V / 1 A
Description
Air-cooled transmitting pentode for Class-B RF power service.
Socket description
Small 5-contact transmitting-tube base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- SMALL5
- Base pins
- 5
- Nominal heater voltage
- 6 V
- Nominal heater current
- 1 A
- 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
1 physical section, each with unique specifications.
Section 1
Pentode
X-ray radiationInterelectrode capacitances
- Transconductance
- 0.0048 S
- Amplification factor
- 96
- Max plate dissipation
- 45 W
Values extracted from Western Electric summary tables; additional table data retained as parameters.
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.