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Radio Record, Volume II, Issue 21, 7 December 1928, Page 4

USE (ORRECT VALVE TYPTS 3 IMDROVE YOUR RECEDTION 50 WHIE TNE SECRET %f VALVING" The reason why one receiver often out- many others of similar desigp i9 tBerg e in the one, the question of valves has been studied and each socket is filled with a tube that is suited for its job: Theother sets have been fitted haphazardly with valves and no care taken to study the requirements of the set. Correct valving is essential ; write for Philips new valve folder and improve yOur radio more than you thought possible. I;dH IILI 1 SMINIWATTS" 8RH1N Lans(NZ JLtd_Radio Dept_Hope Gibbone Bldg_Gourtensu Place, Wellington ldvt 0}Plilios 0405: PHicies 40g Philips A4i5 phiLiPS 0aAudio DDET; REY