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Radio Record, Volume II, Issue 31, 15 February 1929, Page 5

43 "nS WhY PhIlips MINIWATTS are BeItaR ! That 8 the only word SHEER: tbat describes how steep ie the slope of 2 modera Philips Valve: It s the slope (or Mutual Conductance if you like) that determices tbe efici- ency of a tube, for tbe higber, it 18 tbe greater the change in plate curtent for 3 given grid voltage 4# for 0 Pilipe Vales ITS THE SLOPE THAT MAKES FoUera PHILIPS VALVES SO GQQ@ QoB PbIlars "8# AND "Cm PowzeB WNIT_BIMPLICITT Itoebzo Ifvihh IILI 8 SMINIWATTS" BPSN Mr: 3f Pettt Letpe (Nz) L: (Redio Dett} Repe- Gisbons 3elds: Cotrteroy Elicr' Ganirsyin'