Useful Hints

Radio Record, Volume V, Issue 28, 22 January 1932, Unnumbered Page

Useful Hints

UNDOUBTEDLY the best way to make a satisfactory connectioz. .ts a large metal earthing plate is to cut along part of one edge and bend this up so that it reaches above surface level, where it can be inspected. [Tf you have trouble from your aeriai swinging and tending to break the strands at the lead-in tube, you will find that a bit of springy brass or phosphor bronze. soldered to the aerial will overcome the tendency to wear. PSUALLY the chief objection to portable sets is the "B" :consumption, so if you are purchasing such a receiver make sure what this figure is likely to be, or you may find battery renewals far more expensive than you expected. 7 "THEORETICALLY the best place for a volume control is as early in the set as possible, ie., at the R.F. end. "THE directly-heated type of S.G. valve usually requires rather less grid bias than the indirectly-heated type. HEN a grid-bias battery has to be included in an oscillatory circuit (such as biassing for an 8.G. valve) it should be shunted by a large condenser of good quality. ONE disadvantage of the leaky grid detector is that it causes damping and loss of selectivity in the circuit to which it is coupled. A CONTINUOUS howl that does not vary with the tuning adjustment is a sign of audio instability. ys HE grid leak of a short-wave set cit often with advantage be } up to 10 meghoms. qt often pays to lift a short-wave set off the table on which it is standing by means of valve boxes or similar nonmetal supports in order to keep coils, etc., Well above grounded objects. AN output choke system or an output transformer is almost essential for high-quality loudspeaker reproductiog where good volume is required. WING to its excellent insulation properties, glass can be used for + the panel of a radio set, but it is diffieult to drill,