Data set 01
1956 Western Electric Tubes
Published operating points and test conditions from this source.
SECTION 1
Pentode
Characteristic
HeaterOrFilamentVoltage
2 V
HeaterOrFilamentCurrent
1.6 A
Voltage Pentode ·Pentode
285A
Western Electric heater-cathode general-purpose suppressor-grid pentode intended for general electronic amplification.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- MEDIUM5
- Base pins
- 5
- Nominal heater
- 2 V / 1.6 A
Description
Heater-cathode general-purpose pentode.
Socket description
Medium 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
- MEDIUM5
- Base pins
- 5
- Nominal heater voltage
- 2 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
Pentode
X-ray radiationInterelectrode capacitances
- Plate resistance
- 137000 Ω
- Transconductance
- 0.00102 S
- Amplification factor
- 140
- Max plate voltage
- 250 V
- Max screen voltage
- 200 V
- Max screen dissipation
- 1 W
- Max cathode current
- 12.5 mA
Ratings and characteristics promoted from the supplied Western Electric tabular 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
2026 Western Electric 200s
Published operating points and test conditions from this source.
SECTION 1
Pentode
Capacitance
ControlGridToPlateCapacitance
0.5 pF
ControlGridToHeaterCathodeScreenSuppressorCapacitance
4.2 pF
PlateToHeaterCathodeScreenSuppressorCapacitance
7.6 pF