Data set 01
1956 Western Electric Tubes
Published operating points and test conditions from this source.
SECTION 1
Rectifier
Characteristic
HeaterOrFilamentVoltage
1.75 V
HeaterOrFilamentCurrent
350 mA
Rectifier - Half Wave ·Rectifier
297A
Directly heated special-purpose rectifier diode for low-current applications. Rated for approximately 250 V peak inverse voltage, 10 mA DC output, and 60 mA peak-current capability.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- UX4
- Base pins
- 4
- Nominal heater
- 1.75 V / 350 mA
Description
Special-purpose directly heated diode.
Socket description
Medium-shell UX 4-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- UX4
- Base pins
- 4
- Nominal heater voltage
- 1.75 V
- Nominal heater current
- 350 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
1 physical section, each with unique specifications.
Section 1
Rectifier
X-ray radiationInterelectrode capacitances
- Rectifier peak inverse voltage
- 250 V
- Rectifier nominal output current
- 10 mA
- Rectifier peak forward current
- 60 mA
- Rectifier forward voltage drop
- 20 V
- Rectifier warm-up time
- 2 s
Thyratron; published conduction ratings mapped to applicable rectifier-like fields.
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
Rectifier
Characteristic
Maximum Time Averaging Anode Current
0.5 s
Maximum Instantaneous Grid Current
10 mA
Operating Temperature Minimum
-20 C
Operating Temperature Maximum
50 C
Nominal Deionization Time
100 us