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Radio Record, Volume II, Issue 29, 1 February 1929, Page 5

Petrtps miniwatt WHY Philips MINIWATTS are BETTERT X That' 8 the only word SHEERE that describes how ' ateep is tbe slope of a modera Phitips Valve: It'8 the slope (or Mutual Conductance if you like) that determines the efficia ency of a tube, for the bigher, it 1 the greater the change Io plate current for a given grid voltage: As for 0 Philips Valee ITS THE SLOPE THAT MARES Folder. PHILIPS VALVES SO GOQD VoB 0 PHILIPB "3t ard #c" PowER UNIT_BIMPLICITT {Tobebo IFIH Iliifdl} SMINIWATTC" Ip5N Ne: Prtp' Leey' (Ns) M. (Rodio Des:} Nope Giblort EeMalnt; Couho Plooy Berhter