Data set 01
1956 Western Electric Tubes
Published operating points and test conditions from this source.
SECTION 1
Beam Power
Characteristics
Typical Plate Voltage
400 V
Typical Plate Current
53 mA
Other
Typical Power Output
20 W
ClassA
Power - Beam (NOT sweep) ·BeamPower
350B
Beam-power output tube intended for substantial audio-frequency power amplification and general power service, with ratings suited to professional or receiver applications.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- IO
- Base pins
- 7
- Nominal heater
- 6.3 V / 1.6 A
Description
The Western Electric 350B is a heater-cathode beam tetrode with 25 W maximum plate dissipation and about 20 W published power 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
- 7
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 1.6 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
Beam Power
X-ray radiationInterelectrode capacitances
- Plate resistance
- 37500 Ω
- Transconductance
- 0.0083 S
- Max plate voltage
- 360 V
- Max screen voltage
- 270 V
- Max plate dissipation
- 27 W
- Max screen dissipation
- 4 W
- Max cathode current
- 125 mA
Maximum ratings from design-center table; representative Class A1 characteristics at 250 V plate/screen.
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
Beam Power
Capacitance
Grid to plate maximum
0.5 pF
Input capacitance
16 pF
Output capacitance
8 pF
Characteristic
Typical plate current
93 mA
ClassA;PlateVoltage=250V;ScreenGridVoltage=250V;ControlGridVoltage=-14V
Other
Maximum signal power output
10.5 W
ClassA;PlateVoltage=250V;ScreenGridVoltage=250V
Maximum grid circuit resistance fixed bias
0.1 Mohm