NEGATIVE-GRID TRIODE OSCILLATOR AND AMPLIFIER 569 



primarily in the lead arrangement. From the section view of one of 

 these tubes, shown in Fig. 2, it will be observed that the grid and plate 

 elements are supported by wires which in effect go straight through the 



Fig. 2 — Section view of one of the double-lead tubes. 



tube envelope providing two independent leads to each of these ele- 

 ments. The filament leads are at one end only and one of these leads 

 is extremely short. This unusual lead arrangement possesses a number 

 of unique advantages. 



Fig. 3 — Typical oscillator circuit. 



A typical oscillator circuit is shown in Fig. 3. Here the tube is 

 mounted at the center of a half-wave Lecher system. This arrange- 

 ment provides a higher natural frequency circuit than that of the 



