Data set 01
1937 Standard Valves
Published operating points and test conditions from this source.
SECTION 1
Rectifier
Other
Maximum peak anode current
10 A
Construction
Mercury vapor fill
1 boolean
Hot-cathode mercury-vapour rectifier
Rectifier - Half Wave ·Rectifier
4078A
Directly heated hot-cathode mercury-vapor half-wave rectifier for high-voltage, high-current conversion. Rated for approximately 20 kV peak inverse voltage and 2.5 A nominal rectified output.
Directly heatedCold cathodeCommon cathodeDissimilar
- Sections
- 1
- Base
- -
- Socket code
- SPECIAL2
- Base pins
- 2
- Nominal heater
- 5 V / 20 A
Description
4078A is a half-wave hot-cathode mercury-vapour rectifier. The Standard Valves sheet publishes construction, electrical constants, limiting conditions, and applicable operating data.
Socket description
Special 2-contact base
General specifications
Tube and section characteristics
Properties common to every published source and operating point.
Heater and base
- Base
- -
- Socket code
- SPECIAL2
- Base pins
- 2
- Nominal heater voltage
- 5 V
- Nominal heater current
- 20 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
Rectifier
X-ray radiationInterelectrode capacitances
- Rectifier peak inverse voltage
- 20000 V
- Rectifier nominal output current
- 2.5 A
- Rectifier peak forward current
- 10 A
Mercury-vapour or high-voltage rectifier ratings promoted from the published maximum-ratings table.
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
1947 Standard Valves
Published operating points and test conditions from this source.
SECTION 1
Rectifier
Construction
Filling
Mercury vapour
Application
Filter type
Choke input
Supply frequency
50 Hz