Data set 01
1937 Osram Valves
Published operating points and test conditions from this source.
SECTION 1
Ballast
Characteristics
Heater/filament current
300 mA
Regulated current
300 mA
Specialized - Ballast ·Ballast
301
OSRAM barretter current regulator designed to stabilize current in series circuits through the temperature-dependent resistance of its regulating element.
Directly heatedCold cathodeCommon cathodeDissimilarSpecialized
- Sections
- 1
- Base
- -
- Socket code
- B4
- Base pins
- -
- Nominal heater
- -
Description
301: OSRAM barretter current regulator. The complete approved OSRAM sheet was read for construction, characteristics, operating data, and application guidance.
Socket description
European 4-pin base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B4
- Base pins
- -
- Nominal heater voltage
- -
- Nominal heater current
- 300 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
Ballast
X-ray radiationInterelectrode capacitances
No fixed ratings are recorded for this section.
Published characteristics promoted where reliably identified; additional source values retained below.
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
193X Osram
Published operating points and test conditions from this source.
SECTION 1
Ballast
Characteristics
Filament/heater current
300 mA
Other
Operating voltage range
138–221 V