Raytheon RK 707B S-band reflex klystron.

Uses an external clamp-on "McNally" cavity. 140mW output.

This is the S-band version of the 707A which was used as the local oscillator in the SO and AN/APN-7 radars and in the navy LAG signal generator.

Raytheon developed this tube into the 2K28 (1948) by slightly shortening the glass envelope. The 2K28 was used into the middle 1950's in the Gilfillan ASR-1 airport-surveillance radar.

See also K3033 (2K28)