Unnumbered Page Advertisement 1

Radio Record, Volume V, Issue 3, 31 July 1931, Unnumbered Page

Osxan _ noiseless efficiency Jhis OSRAA SCREEN-GPID VALVE MY: 224 is made in Ggland F Your radio incorporates the screen-grid principle You will find that its working will be far more efficient if You substitute an Osram MY. 224 for Your present screen-grid valve: The new Osram series of 2.5 volt valves is definitely non-microphonic Er the only valves that are truly insensitive to vibration or shocks: You can test Osram 2.5' superiority at 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 a pinging noise, indicative of imperfect reception: If the microphonic valves are replaced by Osrami 2.5s, tapplng will result in silence; Ask Your dealer also to Osram show You the full range of Osram 2.5 volc valves Mao MY224, MY.227, MX.245 and MX.280_ 2e vaives 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: