Data set 01
1956 Western Electric Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristics
Typical Plate Voltage
250 V
Typical Plate Current
30 mA
Other
Typical Power Output
3.5 W
ClassA
Power - Pentode (NOT beam) ·Pentode
349A
Western Electric heater-cathode power pentode with approximately 3.5 W Class-A output at documented operating conditions. Designed for general low-frequency power-amplifier service.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater
- 6.3 V / 1 A
Description
The Western Electric 349A is a heater-cathode power pentode with 275 V maximum plate and screen ratings and about 3.5 W Class A output.
Socket description
International Octal
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- IO
- Base pins
- 8
- Nominal heater voltage
- 6.3 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
- Plate resistance
- 80000 Ω
- Transconductance
- 0.0042 S
- Amplification factor
- 336
- Max plate voltage
- 275 V
- Max screen voltage
- 275 V
- Max plate dissipation
- 9.4 W
- Max screen dissipation
- 3.1 W
- Max cathode current
- 50 mA
Promoted from published limiting conditions and representative published characteristics.
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
2026 Western Electric 300s
Published operating points and test conditions from this source.
SECTION 1
Pentode
Capacitance
Control grid to plate
0.65 pF
Control grid to heater/cathode/screen grid
12 pF
Plate to heater/cathode/screen grid
9 pF
Other
Maximum direct screen-grid current
10 mA
Power output
4.7 W
PlateVoltage=250V;ScreenGridVoltage=250V;ControlGridVoltage=-14V;LoadResistance=4000ohm