The tube is over a foot and a half long with separate bore and gas chambers and is wonderfully mounted with lots of nice machined hardware. The laser has externally adjustable mirrors, which are truly separate from the tube and joined by removable rubber bellows exposing the Brewster windows. View 02 - Another view. View 04 - Another view. Here are some photos of the SP-200 Exciter.
All active elements are tubes, of course.
It is a high quality 15 to 25 watt 40.68 MHz RF source consisting of a crystal controlled oscillator and a power amplifier using a 4x150. View 06 - Interior top view. View 07 - Interior bottom view. Coarse mirror alignment is via mounts with three hex-head screws. This would be visible in View 08, clamped to stainless steel Brewster cover and cathode stem.