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Specialized - Thyratron ·Thyratron

VC1257

Three-electrode hydrogen zero-bias thyratron for high-power radar modulators, capable of switching pulses in the tens-of-megawatts range.

Directly heatedCold cathodeCommon cathodeDissimilarSpecialized

Sections: 1
Base: -
Socket code: -
Base pins: -
Nominal heater: 6.3 V / 23 A

Description

Three-electrode hydrogen zero-bias thyratron for high-power radar modulators, rated for pulses up to about 33 MW.

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: 6.3 V
Nominal heater current: 23 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

Thyratron

X-ray radiationInterelectrode capacitances

Max plate voltage: 33000 V
Max cathode current: 2.6 A
Rectifier forward voltage drop: 400 V
Rectifier warm-up time: 900 s

Hydrogen thyratron; 2.6 A is maximum average cathode current, with 2000-A peak retained as parameter.

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

1961 Tung Sol

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Other

Heater voltage
6.3 V
Heater current
23 A
Heater voltage minimum
6 V
Heater voltage maximum
6.6 V
Heater current minimum
20 A
Heater current maximum
40 A
Cathode heating time minimum
15 min
Reservoir voltage minimum
3.5 V
Reservoir
Reservoir voltage maximum
6 V
Reservoir
Reservoir current maximum
12 A
Reservoir
Peak inverse anode voltage maximum
33000 V
Pulse
Peak forward anode voltage maximum
33000 V
Pulse
Peak cathode current
2000 A
Pulse
RMS cathode current
60 A
SquarePulse
DC anode voltage maximum
3500 V
Operating frequency maximum tested
1500 Hz
Peak grid voltage minimum
1100 V
Peak grid voltage maximum
2500 V
Peak inverse grid voltage maximum
650 V
Current rate of rise maximum
10000 A/us
Pulse

Characteristic

Anode voltage drop bogey
200 V
Anode voltage drop maximum
400 V
Anode delay time maximum
0.5 us
Time jitter maximum
0.01 us

Data set 02

1966 Tung Sol Electronic Tubes 3 of 4

Published operating points and test conditions from this source.

SECTION 1

Thyratron

Other

Heater voltage minimum
6 V
Heater voltage nominal
6.3 V
Heater voltage maximum
6.6 V
Heater current minimum
20 A
Heater current nominal
23 A
Heater current maximum
40 A
Reservoir voltage minimum
3.5 V
HydrogenReservoir
Reservoir voltage maximum
6 V
HydrogenReservoir
Reservoir current maximum
12 A
HydrogenReservoir
Peak inverse anode voltage
33 kV
Pulse
Peak forward anode voltage minimum
7 kV
Pulse
Peak forward anode voltage maximum
33 kV
Pulse
Peak cathode current
2000 A
Pulse
Average cathode current
2.6 A
Pulse
RMS cathode current square pulse
60 A
Pulse
DC anode voltage
3.5 kV
Operating frequency extensively life-tested
1500 Hz
Pulse
Peak grid voltage minimum
1100 V
Trigger
Peak grid voltage maximum
2500 V
Trigger
Peak inverse grid voltage
650 V
Trigger
Grid pulse rise time
0.35 us
Trigger
Grid pulse width at 70.7 percent
2 us
Trigger
Current rate of rise
10000 A/us
Pulse
Ambient temperature minimum
-55 degC
Ambient temperature maximum
75 degC
Peak pulse power
33 MW
RadarModulator

Characteristic

Cathode heating time
15 min
Reservoir heating time
15 min
HydrogenReservoir
Anode voltage drop minimum
100 V
Conducting
Anode voltage drop nominal
200 V
Conducting
Anode voltage drop maximum
400 V
Conducting
Anode delay time
0.5 us
Pulse
Time jitter
0.01 us
Pulse

Construction

Gas fill
Hydrogen

Application

Application
High-power high-voltage radar modulator
PulseModulator