THE RADAR RECEIVER 



711 



The simplified schematic of a typical radio-frequency amplifier which 

 employs a GL-2C40 vacuum tube operating at approximately 1000 mc is 

 given in Fig. 7, together with an outline of the mechanical arrangement of 

 the tuning elements. This amplifier is of the tuned-grid, tuned-plate type 



ANODE CONNECTION 



GRID 

 CONNECTION 



ACTUAL SIZE 



ENLARGED SECTION 



Fig. 6. — Constructional Features of the GL-2C40 (Lighthouse) vacuum tube. 



of circuit where the input and output circuits consist of coaxial transmission 

 line elements tuned by sliding plunger or ring elements, and is so constructed 

 to include the CiL-2C4() tube as an integral part of the tuning structure. 

 The input coupling to the amplifier is achieved by means of a probe extend- 



