Data set 01
1938 Triadyne
Published operating points and test conditions from this source.
SECTION 1
Ballast
Other
OverallVoltageDrop
50 V
At 300 mA
OperatingCurrent
300 mA
Specialized - Ballast ·Ballast
50A2
Tapped 50 V, 300 mA ballast current regulator for AC/DC receiver heater strings, including a pilot-lamp tap and surge-reducing action during warm-up.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- UX4
- Base pins
- 4
- Nominal heater
- -
Description
A tapped ballast tube for AC-DC radios, designed to drop 50 volts at 300 mA while providing a pilot-lamp tap and reducing heater-current surge during warm-up.
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
- -
- Nominal heater current
- -
- 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
Ballast
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Ballast/resistive section; source specifies 50 V drop at 300 mA rather than plate 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.