Rectifier - Half Wave ·Rectifier
5857
National Union rectifier documented by manufacturer registration data. The available source confirms a heated rectifier section but does not provide enough application detail for a narrower specialized classification.
- Sections
- 1
- Base
- -
- Socket code
- B9A
- Base pins
- -
- Nominal heater
- 6.3 V / 450 mA
Description
National Union 5857 other vacuum tube described in the approved datasheet for its stated amplifier, rectifier, indicator, or specialized electronic service.
Socket description
Small-button Noval 9-contact
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- B9A
- Base pins
- -
- Nominal heater voltage
- 6.3 V
- Nominal heater current
- 450 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
- Plate resistance
- 70000 Ω
- Max plate voltage
- 350 V
- Max screen voltage
- 75 V
- Max plate dissipation
- 1.5 W
- Max cathode current
- 2.6 mA
Promoted ratings/characteristics read from the approved National Union datasheet.
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.