| OCR Text |
Show When You Select New Tubes for Amplifiers In impedance-coupled audio-frequency amplifiers, imnedance-coupled radio-frequency amplifiers and resistance-coupled audio-frequency amplifiers, ampli-fiers, the amplification obtainable from the entire system is dependent upon the amplification constant of the vacuum tubes employed. Standard vacuum tubes with an amplification constant of approximately eight will not produce best results. Greatest amplification will he obtained when "Ill-Mu" tubes or high amplification constant tubes are used. Tubes with amplification constant of 20 are now-available. now-available. i |