Unnumbered Page Advertisement 1

Radio Record, Volume V, Issue 13, 9 October 1931, Unnumbered Page

Osram _ noiseless efficiency Jhis OSRAM SCREEA-CPID VALVE MY 224 is made in Ggland F Your radlo incorporates the sereen-grid principle you will find that its working will be far more efficient ie You substitute an Osram MY. 224 for Your present screen-grid valve: The new Osram series of 265 volt valves is definitely non-microphonic 45 the only valves that are truly insensicive to vibration Or shocks: You can test Osram 2.5' superiority at Your Radio Dealer'$. 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, indicative of imperfect reception: If the microphonic valves are replaced by Osram 2.5s, tapping will result ip silence; Ask Your dealer also to show You the {ull range Osra 0f Osram 2.5 volt valves ~MY,224 MY.227, 25 MX.245 and MX28O. 0 vales 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- churcha