THE A.W.A. TRANSFORMER

Radio Record, Volume I, Issue 52, 13 July 1928, Page 12

THE A.W.A. TRANSFORMER

| LAst week the new A.W.A. Superaudio transformer was introduced to constructors, Full particulars have now come to hand as follow:The primary inductance has been kept as high as is possibly consistent with the price of the transformer (18s.). The cross section of iron in the core of A.W.A. Super-audic Transformer can be gauged both from the mimimum airgap and from the overall dimensions and weight, as shown’ here :- Overall dimensions: 2 7-16 x 2 7-8 x 2} inches. Weight: 1lb. {oz. In the new A.W.A. Super-audio, Transformer a comparatively. ‘heavy gauge of copper: wire is used in the windings to diminish the risk of burnouts, and to decrease the resistance. Below are given the safe limit of steady plate currents for the respective ratios, and it will be noted these are comparatively high values :- Limit of Steady Ratio . Plate Current. 2 tol «ose o to 4 milliamps 34 tol eoes 40 5 milliamps 5 tol «++» 6 to 7 milliamps The 2 to i transformer is best used in conjunction with the detector valve, where the plate current is relatively low. If the steady plate current of the first audio valve exceeds the limit — shown for the 2 to 1, then a 84 to 1 or a 5 to 1 transformer should be used in conjunction with it. As a general rule, the lower the ratio of the transformer, the better will be the reproduction, provided the steady plate current does not exceed the limit: shown.