.4 NEW MICROWA VE TRIODE 



533 



solder.f The shell of the tube is grasped by the springy contacts around 

 the bottom of the input cavity. Above the tube the plate lead projects 

 into the cylindrical space which can be adjusted to the desired size by the 

 quarter wave slug seen to the right of the circuit. This makes contact to 

 the walls of the outer cylinder by spring fingers on each end. Contact to 

 the plate lead is then made through the movable slotted inner conductor, 

 seen on the extreme right of Fig. 5. 



The input face of the circuit. 



Figure 6 gives an exploded view of the details of the circuit, showing the 

 simplicity of the construction which permits easy assembly. The guide pin 

 which serves to keep the inner conductor of the transformer from ro- 

 tating as it slides up and down on the plate lead during the tuning process 

 can be seen on the third detail to the right of the main block. Also there 

 is provision for external resistive loading to be introduced into the plate 

 cavity through the small square holes in each side of the block. A screw 

 mechanism adjusts the penetration of the loading resistive strip into the 



t The early experimental tubes were soldered into the circuits. Chiefly through the 

 efforts of Mr. C. Maggs and Mr. L. F. Moose, of B. T. L., who undertoo'.c the dsvelopmsnt 

 of the tube for production by the Western Electric Company, the present ■iI6A tubes 

 come with a threaded grid tiange to facilitate replacement. 



