Questions and Answers

Radio Record, Volume XI, Issue 1, 10 July 1936, Page 62

Questions and Answers

" R.F." (Nelson): Probably the best * way to run the eliminator frem 32 volts would be to tap off three cells of the battery. This would obviate the trouble due to sparking at the contacts that would otherwise be encountered if the primary were wound to run from the 82 volt direct. . W." (Aramoho): Possibly the type * 30 valve followed by the 83 would be as good as any other con:bination. It is usually necessary to use a type 33 directly after the detector, but in a quiet locality it would be possible to use the two stages without too much background noise being apparent A good addition is to use a volume contro] aasoviated with the first stage. the 80 valve in this case, "W A" (e/o J.W.R., Southlend) : *Your query about your set is ditficult to answer without some descri; tion of the set itself; write again, giving more detail. The use of a six-volt battery in the way you.describe is liable to be dangerous to the filaments and, although the filaments may be intect, we are inclined to think that they have been flashed and hence now useless. A new set of valves seems indicated. "W}X94A" (Pokeno): The trouble with that set weems, from the eymptoms you give, to lie in a faulty cundenser. One of the by-paes ones has evidently openly circuited; this allows the set to oscillate a little. Try placing a good condenser temporarily from the vavious B positives to chassis, etc, The transformer does not sound as though it were at fault. I.S." (Duddingston, North Taieri) : * Even if your set is correctly aligned there may be weak responses to the harmonies of any powerful local station. In your cese they seem to be in the normal position on the dials, and, in that care, can be neglected unless they interfere with the reception of other stations. in which case have the set realigned by the agents. "TALIMENATOR" (Inglewood): The eliminator you have will give a whole series of voltages from the varioustappings depending on the current drawn tvtom each tap. ‘The makers used to issue with them a pamphlet where a chart enabled one to calculate the approximate voltage for any tap, and we suggest that you write them for one. ’ ‘The second row are for C bias tapping, the values for which are marked over the "little holes." The aerial you suggest does not seem to offer any advantage, and the addition of a condenser where shown would cause the aerial to act more as a loop aerial with its directional properties. Actually the higher pole should be the furthest from the set and the iead-in taken from the "home" end,