Correct C. Battery

Radio Record, Volume I, Issue 28, 27 January 1928, Page 2

Correct C. Battery

Go into the shops of many New Zealand radio dealers and ask what amount of C battery is required by one of the popular makes of valves, and the dealer will look at you nonplussed. The time has arrived when every set employing audio frequency requires a grid-biasing battery. The following valve table should he cut out and kept handy by every dealer :-

L.S.C. equals loudspeaker coupling of either. choke coil and by-pass condenser or output transformer of 1 to 1, or step-down ratio, recommended wher-~ ever plate current (D.C.) exceeds 10 milliamperes. The device known as @ "siftron" serves the purpose adequately, ; \

Detectors and Amplifiers. Power amplifiers. ne Model. WD-11 Wx-12 UX-112Aa Uv-199 UxX-199 UX-200A UX-201A UX-222 UX-222 UX-226 DY -227 UX-240 UX-112Aa UX-120 UX-17iAa UX-210 The UX-210 valve requires a filament Use. Detector or amplifier Detector or amplifier Detector or amplifier Detector or amplifier _ Detector or amplifier Detector amplifier Detector or amplifier Radio freq. amplifier aAudo freq. amplifier Amplifier A-C filament type Detector A-C heater type Detector or amplifier Power amplifier Power amplifier Power amplifier Power amplifier Cireuit requirements. Transformer eoupling Transformer eoupling Transformer coupling Transformer coupling Transformer coupling Transf. or Transformer SO coupling 185 9 Special 135 iat shielding Special 180 14 shielding Transformer 80 6 coupling 185 9 180 133 Transformer Foltlewing UY-227 characcoupling teristic apply only detector connection Resistance 35 14 coupling 180 8 No. L.8.¢. 135 9 required Wii 104 No. L.8.¢. 135 223 required L.S.C. except 9 163 at 90 ¥. 135 27 180 404 20 18* 300 223* L.§.C, 350 27* 400 314% 423 30* Amplifier Amplifier B battery C battery yoltage. voltage, 90 4h 135 104 98 43 1385 104 $0 44 135 9 90 43 90 4} Following UX-200A charresist. coupling acteristics apply only for detector commection