TMD Technologies Offers TWT Power Modules
The tubes address a need solid-state technology cannot.

TMD Technologies (Hall 1 1134) recently released a new range of high-power Traveling Wave Tube (TWT) power modules. There are still some important applications for TWTs that solid-state technology cannot address. However, TMD also offers the latest Gallium Nitride (GaN) microwave power modules (MPMs), which are optimized for electronic warfare (EW) applications.