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FG33

Industrial thyratron for controlled-power switching. Available source material establishes thyratron service without supporting a narrower gas classification.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 5 V / 4.5 A

Description

The FG33 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

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base: -
Socket code: -
Base pins: -
Nominal heater voltage: 5 V
Nominal heater current: 4.5 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 0

Thyratron

X-ray radiationInterelectrode capacitances

Max plate voltage: 1000 V
Max cathode current: 2.5 A

Thyratron. Forward peak anode maximum and average anode current promoted.

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 01

1956 National Electronics Industrial Tubes

Published operating points and test conditions from this source.

SECTION 0

Thyratron

Other

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

Characteristics

Heating time
300 s
Published datasheet value
Typical arc drop
15 V
At stated peak current
Ionization time
10 us
Approximate
Deionization time
1000 us
Approximate
Anode-grid capacitance
2.7 pF
Published capacitance

Data set 02

1968 General Electric Co

Published operating points and test conditions from this source.

SECTION 0

Thyratron

Other

Peak Inverse Anode Voltage
1000 V
Instantaneous Anode Current
15 A
25CyclesAndAbove
Surge Anode Current
200 A
DesignOnly

Characteristic

Peak Voltage Drop
16 V
Typical