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Radio Record, Volume II, Issue 25, 4 January 1929, Page 5

Tri3 Bsq Fok S-Ro So6a 84 (6m) 0 TZ SLOPE, Or as it is often % S-isv called, Mutual Con- E Qma ductance, indicates just how good a radio valve is. The higher the slope the larger the change in plate E" current for a given grid 3 voltage: Look at the slopes of 43 Philips ((- Miniwatts: 3) Some E9 7 of them you will see are as high as 2.4 mAIV. Com- pare their figures with corresponding types of other makers Yatolt} Ipdh HI Iliifds 66 MINIWATT '9 VALVES 8RZ6N Advt: of Philips Lamps (N.z) Ltd; (Radio Depe:), Hope Gibbons Bldg , Courtenay Place, Wellington 1 1 0 1 Phiipi B443 1 L PhILiPS 8 IliIPS 6