Specialized - Thyratron ·Thyratron
Industrial thyratron for controlled switching and rectification. Available source material confirms the thyratron role without a narrower gas classification.
The FG57 is a National Electronics thyratron intended for control, timing, ignitor-firing, or related industrial switching service, with published peak-voltage and current ratings.
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 0
Thyratron. Forward peak anode maximum and average anode current promoted.
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.
Maximum peak inverse voltage
1000 V
Published datasheet value
Maximum peak forward voltage
1000 V
Published datasheet value
Maximum DC output current
2.5 A
Published datasheet value
Maximum instantaneous output current
15 A
Published datasheet value
Maximum AC short-circuit current
200 A
Published datasheet value
Heating time
300 s
Published datasheet value
Typical arc drop
12 V
At stated peak current
Ionization time
10 us
Approximate
Deionization time
1000 us
Approximate
Anode-grid capacitance
2.5 pF
Published capacitance
Data set 03
Published operating points and test conditions from this source.
Peak Inverse Anode Voltage
1000 V
Instantaneous Anode Current
15 A
25CyclesAndAbove
Surge Anode Current
200 A
DesignOnly
Peak Voltage Drop
16 V
Typical