Useful Hints

Radio Record, Volume III, Issue 42, 2 May 1930, Unnumbered Page

Useful Hints

Dorr rely on. an ordinary house switch to cut off the supply from your eliminator-sometimes it doesn’t! * * . * A GREAT improvement in crystal reception will often occur if the crystal is cut in two, or chipped, and a clean surface is exposed for use instead of the old dirty one. a 1% * UDIO transformers, especially of the unshrouded type, should never be mounted close to one another, and should always be used with their cores placed at right angles, * eS A GRID leak inserted between the grid of the first audio valve and j&he wiring to this, is useful to obviate roubles due to radio frequency superimposed on the audio. (The valve of ’ ths resistance should be about a quarter of a megohm.) cd * *- FIN E adjustment of oscillation is very important in the control of a shortwave set, and the use of a different valve grid leak will often give improved results, a By JREMEMBER that a soldered joint should always be wiped whilst it is hot with a clean cloth to remove all traces of flux easily. * * @ PIECD of stiff paper or blotting paper pushed over terminals, etc., before they are coated with flux, will prevent this from reaching the panel and impairing efficiency * % % pe not attempt to use an ordinary potentiometer for volume control purposes, as in such cases the resistance should be about equivalent to that of a grid leak, ie, a quarter of a megohm or more,