Unnumbered Page Advertisement 1

Radio Record, Volume IV, Issue 45, 22 May 1931, Unnumbered Page

Osram_ noiseless efficiency Jhis OVRAA SCREE -GRID WALME Ml: 224 is made in Ggland F Your radio Incorporates the screen-grid principle You wlll find that its working will be far more efficient if You substicute an Osram MY. 224 for Your present screen-grid valve: The new Osram series of 2.5 volt valves Is definitely non-microphonic Mantto the_ only valves that are truly 'insensitive to vibration Or shocks. You can test Osram 2.5' superiority 2t Your Radio Dealer's. Ask to switch on any set, tune out all stations and tap the 224 Or 227 detector: If it is microphonic the speaker will emit: 3 pinging noise; Indicatlve of imperfect reception: If the microphonic valves are replaced by Osram 2.5s, tapping will result In silence. Ask your dealer also to Osran show You the full range 0f Osram 2.5 volc valves Mo MY224, My,227, MX245 and MX.280. 25e valves Made in England Advertisement of the BRITISH GENERAL ELECTRIC CO: LTD 37 Taranaki Street; Wellington. Brunswick Bldgs , 49 High Street, Auckland: Hannaford Chambers, 145 Worcester Street, Christ- church: