Piiani electron tubes & devices supplies a forced air cooled 6 kw power output triode tube for use as an oscillator tube in dielectric heaters and rf induction heaters. It is of coaxial terminal structure and rugged grid construction, and is ideally suited for industrial heating applications. This tube can be used as a direct replacement for indigenous and imported tubes of similar power output ratings. It is manufactured with two different types of radiators equivalent to those of commonly used tubes in the country. Forced air cooled tubes up to 20 kw power output and water cooled tubes up to 100 kw are also being manufactured.