NL-5557/FG17 Tube Specs

The NL-5557/FG17 is a high-quality gas-filled hydrogen thyratron electron tube designed for high-voltage, high-speed pulsed RF applications. Below are the general technical specifications. For full details, see the datasheet in the section below.

Specification	Details
Operating Voltage	Up to 36,000 volts
Peak Current	Up to 600 amps
Delay Time	< 0.5 microseconds
Tube Type	Hydrogen thyratron
Cooling Method	Air or water (based on system design)
Envelope Type	Ceramic/Glass
Frequency Compatibility	Up to 110 MHz
Common Applications	RF sealing, dielectric welding, pulse modulators

NL-5557/FG17 Tube Data Sheet Download

For full performance and power specs, frequency response, and mounting details, download the complete NL-5557/FG17 tube data sheet below. Ideal for technicians, engineers, and maintenance teams working on high-voltage RF systems.

Download NL-5557/FG17 Datasheet (PDF)

NL-5557/FG17 Tube Substitute & Equivalent Information

The NL-5557/FG17 is a widely used hydrogen thyratron designed for fast-pulse switching in RF generators, RF sealing equipment, and dielectric welding systems. If you’re looking for a Richardson NL-5557/FG17 tube equivalent, Penta Labs offers fully compatible replacements that meet or exceed OEM specifications.

This tube is ideal for systems where fast recovery time, high peak current, and precision pulsing are critical. It's frequently used in plastic welding, food packaging, and medical RF pulse modulators.

As trusted vacuum tube dealers, we carry a large inventory of hard-to-find and specialty tubes. Browse our full range of vacuum tubes for sale, or explore related product categories like hydrogen thyratron, RF sealing equipment, and high frequency welding.

Let our team help you source the exact NL-5557/FG17 tube equivalent for your application, contact us today.

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