Unnumbered Page Advertisement 1

Radio Record, Volume IV, Issue 35, 13 March 1931, Unnumbered Page

MR; WATT DOES SOME RESEARCH WORK once wanted to know why, when bought a new set 0f Philips Valves, got better results than before: Looka ing up my radio encyclopadia found the following explanation 81 On account of the continual electron-emission at high temperatures; the filaments of the valve dete- riorate after a period of use with the result that 0 decrease of the electron-emission takes place which affects the quality of the receptien: As the emisslon decreases very slowly the deteriorating tone of the recelver is scarcely notieeablet and only by comparison with new valves can it be determined: Therefore, it i wrong to Use valves too long ancl those who res quire consistently, good radio must renew their valves when necessary. Ph L/ WATCHI JOR Radio_firl Valves #� A E A P* T U B E 1$ #C H E A P " IN N A ME 0 N L Y WbOr Mv Ns Rrzlips Lamas (HNsZs) Limitedg PsO, Box 16732. Wellington: Auckland Oiice ; Paykel' $ Building, Anzac _ Ave Crristchurch Ofjice 8 226 Tuan Streets 8 0