]fAGXETRON AS GENERATOR OF CENT!}fErER WAVES 267 



Fig. 43— Four tunable magnetron oscillators. They are: (1) the 4J42 magnetron (40 

 kw., 660 to 730 mc/s); (2) the 4J51 magnetron (275 kvv., 900 to 970 mc/s); (3) the 5J26 

 magnetron (600 kw., 1220 to 1350 mc/s); and the 2J51 magnetron (5^ kw., 8^00 to 9600 

 mc/s). 



in which work has been done. It illustrates both the coaxial and wave- 

 guide types of output circuits, the use or not of attached magnets, and the 

 two types of input leads and cathode supports. In Fig. 43 is shown the 

 group of tunable magnetrons developed as replacements for fi.xed fre- 

 quency models with which they are electrically and mechanically inter- 



