Specialized - Thyratron ·Thyratron
Mercury-vapor grid-controlled thyratron for industrial controlled rectification and power-control switching.
Ref.: 3V/390A Hot-Cathode Mercury- 3V/390B Vapour Thyratrons 57 (CV5027) Codes: 3V/390B (CV5028) < Type 57 is a three-electrode mercury-vapour thyratron developed mainly for use in Industrial Control applications. It is equivalent to the U.S.A. type FG-57. The 3V/390B is an electrically identical thyratron on a British 4-pin base.
General specifications
Properties common to every published source and operating point.
Electrical assignments shared by every tube using this base designation.
No verified pinout is recorded for this base designation.
1 physical section, each with unique specifications.
Section 1
Values transcribed from the approved datasheet; additional published data retained as parameters.
Source-dependent data
Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.
Data set 01
Published operating points and test conditions from this source.
Anode to grid
3.5 pF
Published direct interelectrode capacitance
Grid to cathode
8.5 pF
Published direct interelectrode capacitance
Heater/filament nominal current
4.5 A
Nominal published value
Data set 02
Published operating points and test conditions from this source.
Peak forward anode voltage
1 kV
Peak inverse anode voltage
1.5 kV
Peak anode current
15 A
Mean anode current
2.5 A
Cathode preheating time
5 min