A HIGH POWER VACUUM TUBE 



IS 



nickel collar N and the support rods P. The grid lead is brought 

 out through the tube Q. The tube is completed by sealing together 

 the flare R and the bulb C. 



In this tube all welds except those in the collar N are eliminated, 

 the assembly being bolted together. The drawing of the anode does 



Fig. 10 



away with the leaks that were troublesome in the older tubes and 

 the manufacture of the tube can be carried out with certainty. 



With this tube as much as 12 k. w. have been obtained in an arti- 

 ficial antenna working at 12,000 volts. This power was obtained 

 at a frequency of 600,000 cycles corresponding to 500 meters wave 

 length. The difficulties of obtaining this amount of power at this 

 frequency using a number of smaller tubes in parallel, are obvious 

 to anyone who is acquainted with the problem. On a D. C. test the 

 anode w^as found to be capable of dissipating 26 k. w\ when cooled 

 with water. 



