Unnumbered Page Advertisement 1

Radio Record, Volume V, Issue 5, 14 August 1931, Unnumbered Page

Vouli find this screen-grid valve is beller Jhe OSRAA My 324 MADE IBJ ERGLAED PEREECT _ radio detection is a matter of perfect valves. Thls new 2.5 volt Osram is, like the entire 2.5 Osram series, definitely non-microphonic: Shocks or vibration do not affect it. It is the ONLY screen-grid valve that is perfectly noiseless in operation. You can test: Osram 2.,5 at your Radio Dealer's. Ask to switch on any set, tune sueeoicritY out stations and tap; the 224 or 227 detector: If it is microphonic the speaker will emit 2 pinging noise, indicative of imperfect reception: If the micro- phonic valves are replaced by Osram 2.5s, tapping will result in sllence. Ask your dealer also to show You the full Osram range of Osram 2.5 volc valves MY.224 MY.227 MX.24S & MX.28O 25e yavves 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: