Unnumbered Page Advertisement 1

Radio Record, Volume IV, Issue 52, 10 July 1931, Unnumbered Page

Voull find #his screen-grid valve is belter Jhe DSRAA MY 234 MADE-In ENGLARID PEREECT radio detection is 2 matter of perfect valves. This new 2.5 volt Osram is, like the entire 2.5 Osram series, definitely non-microphonic: Shocks or vibration do not affect it, Ic is the ONLY screen-grid valve that is perfectly` noiseless in operation: 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 micro- Phonic valves are replaced by Osram 2.5s, tapping will result in silence. Ask Your dealer also to show You the full range of Osram 2.5 volt valves 8532 MXZ45_ & MXz88 25e 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- churchr