QUESTIONS AND ANSWERS

Radio Record, Volume X, Issue 9, 11 September 1936, Page 47

QUESTIONS AND ANSWERS

"(XURIOUS" (Frankton): ‘The con‘nections for the’ tuning indicator.of the "High Fidelity 13" are shown very clearly on the under-chassis. wiring diagram. And all wires from the 6E5 socket surely do come through the chassis. although the heaters and earth leads were not drawn jn so that the diagram would be clearer. . A.: The’ finch hole was in the chassis for another purpose, as the chassis was a standard one, but it is not in use in the present set. "A.: A’ pick-up, if used, should be fed to' the GAG grids by means of ag pushpull transformer, the correct ratio of which, ete., is best found by trial. "NTEW READER" (Okoroire): It is very difficult to say what is wrong With your reception, as the receiver you have is capable of excellent work. The description of your aerial conveys no impression that it is too small, ete. The noisés that you hear may be due to a faulty valve or some component in the set, and, taking, things altogether, we suggest that you. get in touch with the dealer from whom you. bought the set. Give ‘all the details of the trouble you have so that he can see whether he should :-go to see the receiver at work ‘or not, " AMATEUR" :(Lawrence): The type 82 would work quite well in the circuit: you give, and there should be no alterations necessary. . . Avr The. reaction .condenser you have would. be more than: sufficient, as the usual 23-plate condenser (midget) is only 0.0001 mfd, in capacity. . "((RYSTAL SHT" (Kaipaki): The . typeof headphones you mention, if it.is superior to the ayerage, would certainly be an advantage, but we have no details of ‘it. ‘But you-are getting: very good -results as it is, and if you can obtain: details of these headphones and write again, we may be able to say whether they would be worth obtaining. ‘A.:-In the 1986 "Radio Constructor’s Guide" there is a description of a-one-valve amplifier for a crystal set, and also a description of a battery suitable for running the filament. "TYTNSTABLE" (Westport): On reading your ‘troubles, the’ causes seem to boil, down’ considerably if the three questions ‘are taken: together. The first thing to do is to:check up on the: volume control. itself, as it. sounds as though it were open circuited near, that critical

point. If this, or the substitution of another volume control, does. not correct things, a close check up on the remainder of the set for faulty condensers, etc., will be necessary. The whistles can be caused by faulty condensers and resistors, just as well as wires closer than they should be to each other. e

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