LO.U) C. /A'A')7.\'(; L\ll'.lCri V Ol- AMI'LII'lIiRS 



i79 



No. 1 shown in I'ig. 2 is used for amplification from very low up to 

 medium powers in Public Address, Radio Broadcasting and similar 

 systems. Provision is made for operating this amplifier on either 180 

 or 350 volt anode potential and tests were made under both these 

 conditions. This amplifier is designed to work from an impedance 

 of 200 ohms into one of 4,000 ohms. Amplifier No. 2 shown in Fig. 3 



INPUT TRANS 



VOLTAdC f^ATIO 

 / S 



TYfe 2 



VACUUM Tl/Bi 



0,0 



OUTPUT TRAMS 

 VOLrAOf /fATiO 



a. 36:/ 



Fig. 4 — Amplifier No. 3 



mtryiOe A-AT/O I 2 56 VACUU% Ti/g£ 



VOlTA'Jc: r?A!-/o / / 

 -O 



fP£T CO/L 



ouTPi^r 



PO*v£'>? r/fA/vsraffMca 



//O VOLTJ (^O ^ 



Fig. 5— Ainplifiet- No. 4 



