7620/HY-10 Hydrogen Thyratron

The HY10/7620 manufactured by EG&G is a unipotential cathode, three-element hydrogen thyratron housed in a rugged ceramic envelope. Its compact size and robust construction make it ideal for use in high-performance radar modulators and other demanding applications where reliable high-voltage switching is required.

Features:

• Unipotential cathode design for stable operation.
• Three elements (cathode, grid, anode) for control and switching.
• Ceramic envelope provides ruggedness and enables a compact size.
• Suitable for high-performance radar modulators and similar applications.

Technical Specifications:

Electrical Characteristics:

• Cathode Heater Voltage: 6.3 Volts AC (nominal), 5.8 to 6.8 Volts AC (range)
• Cathode Heater Current: 7.8 Amperes (nominal), 6.5 to 9.0 Amperes (range) at 6.3 Volts AC
• Reservoir Heater Voltage: 6.3 Volts AC (nominal), 5.8 to 6.8 Volts AC (range)
• Reservoir Heater Current: 2.8 Amperes (nominal), 1.0 to 4.0 Amperes (range) at 6.3 Volts AC
• Minimum Heating Time: 5 minutes

Maximum Ratings:

• Peak Anode Voltage, Forward: 20.0 kV
• Peak Anode Voltage, Inverse: 5.0 kV (during the first 25 μs after conduction)
• Minimum Anode Supply Voltage: 1.0 kV DC
• Peak Anode Current: 500 A
• Average Anode Current: 500 mA
• RMS Anode Current: 8.0 A AC (computed as the square root of the product of peak current and average current)
• Maximum Pb (epy x ib x prr): 10.0 x 10⁹
• Maximum Anode Delay Time: 0.5 μs (see notes below)
• Maximum Anode Delay Time Drift: 0.1 μs
• Maximum Time Jitter: 0.005 μs (see notes below)
• Ambient Temperature: -55 to +125 °C

Trigger Requirements:

The pulse produced by the driver circuit should have the following characteristics when measured at the tube socket with the grid disconnected:

• Amplitude: 200-500 Volts
• Duration: 2 microseconds (at 70% points)
• Rise Time: 0.5 microseconds (maximum)
• Impedance: 50-500 Ohms

Mechanical Characteristics:

• Mounting Position: Any
• Base: See Outline Drawing
• Cooling: Anode cooling is permissible.
• Dimensions: See Outline Drawing

Notes:

• The limits of anode delay and anode time jitter are based on the minimum trigger voltage. Using the highest permissible trigger voltage and lowest trigger source impedance can significantly reduce these values.
• The anode delay time is measured between the 26% point on the rising portion of the unloaded grid voltage and the point at which anode conduction first appears on the loaded grid pulse.
• Time jitter is measured at the 50% point on the anode current pulse.

Data Sheet available upon request