LOAD CARRYING CAPACITY OF AMI'LIl'lERS 



585 



outputs above .05 watts the third harinonic increases rapidly and 

 then falls somewhat while the second harmonic falls to a minimum 

 of about 2% at .14 watt output and then increases rapidly. The 

 fourth and fifth harmonics follow similar cycles of increase and de- 

 crease, the fourth following the second and the fifth the third. 



To assist in interpreting the stages in the tube overloading at 

 which these changes in the percentages of the different harmonics 



1.36 WATTS 



1.67 WATTS 



2.1 WATTS 



Input Voltage > 



Fig. 12 — Amplifier No. 1; 1,000 c.p.s.; load 4,000 ohm resistance, 350 volt plate supply 



take place the waves corresponding to the vertical deflections of 

 some of the oscillograms have been projected against a time axis by 

 an appropriate geometrical construction, assuming the horizontal 

 deflection a sine wave as it very nearly was. 



These projections for four of the oscillograms of Fig. 11 are show^n 

 in Fig. 11-A, a pure sine wave being drawn against each figure for 

 purposes of comparison. Up to an output of .0-47 watt the curved 

 characteristic of the tube results in the asymmetrical wave shown 



