Unnumbered Page Advertisement 1

Radio Record, Volume V, Issue 8, 4 September 1931, Unnumbered Page

Osam noiselexs elfficiency Jhis OCRaML SCREEL GRID VALVE Mi 224 is made in Ggland F Your radio incarporaces the screen-grid princlple You will find that its working will be Tar More efficient If You substitute an Osram MY. 224 for Your present screen-grid valve: The new Osram series of 2.5 vok valves' is ~definitely non-microphonic Yata the only valves thac are truly Insehsitive t6 vibration Or shocks: You can test Osram 2.5' superiority a0 Your Radio Dealer 8. Ask to switch on any sec, tune out all statlons and tap the 224 Or 227 detector; If it is microphonic the speaker will emie 3 pinging noise; ' indicative 0f Imperfect receptlon; Lf the microphonic valves are replaced by Osram 2,58, tapping 4 will resulc in silence:' Ask your dealer alsa to show You the full range Ostam of Osram 2.5 volc valves t MY.24, MY.227, MX.245 and MX.28O. "232 ialves; Made_ in England Advertisement df the e#i0 fs1n; BRITISH GENERAL "ELECTRIC CO LTD. 31 37 Taranaki 'Street; WWeliingtor: 47" 4 SR ict Brunswick Bldgs ; 49 High' Street, Auckland Ji 0 S274 Hannaford Chambers;' _ '145 Worcester Street, Christ Ur; church: ~XE