Show parallel tubes reduce impedance aid output in various set building experiments colas on 0 there appears to be nn an inclination cli toward tile the ure line of 0 parallel tuta that la Is two tubes with their grads connected to to ue thi input and thelt cintes connect connected cd together to tho the eircil lt rn ra studying tills this tip cypa of tube connection it must be borne in mind that tho the push pull combination Is not a parallel tube armil gement it li 1 4 more of a relay Brite iu one tube takes up tile when tile the other lets RO go in connecting two grids together Rethor tO both grids uru tiro nt at the same annio voltage nt at A P system that reduces impedance and improves the output the same time both plates belne being con eted together tire me tit nt tile lio same voltage olt lit fit tin tile sanie instant but un all essential in sil looth action Is that hoth tubes bp be ellke ce which iii happen us it lq li the lie salilo with a 11 beitin of nt horam laii aca they tire matched there will be a emerence in ili the lie work ork they do aside fi om these considerations putting the input circuits in ili par cuts the input impedance to onelia lf ot of its vilgio plate in parallel tilts cuts the output impedance to half value in the output circuit cli cult therefore to mutch match the tube impedance ance the or choke or re sl st stance would naturally have one half the impedance lm edinch ed ince it had bad when matching a single tube tabs in other words smaller chokes and smaller primary inductances will rive give better results than the high values assuming the latter to he correct for a single tube but another way the cheaper apes which do not give such desirable effects on a single tube should be better on the parallel tube |