Well known colllecytor Udo Radtke with a Brown Boveri BTW150-2 power triode. The little package carries a dissapation rating of 220kW. Technical data and more photos are available at http://www.tubecollection.de/types/BTW150-2.htm. Note the spiral oxidation pattern on the anode, presumably the result of a cooler designed to give a helical flow of the cooling water.
In this issue
- Origin of the British Screened Grid Valve: The Marconi-Osram S.625
- Harry Houck anf the Electrad Diode
- The IBM Counter Tube
- Celebrating the Johnsonburg Radio Co. JRC Prototype KGG and Gloq-Tube Regulator
- Photos from Johnsonberg
- Radio Tube Works Almost Ready for Start
- J’burg and the 2B6
- A very Special and Unusual 5U4-G
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