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The Grid
QUESTIONS AND ANSWERS
The Grid is a Question and Answer Department maintained especially for the radio amateurs. Full answers will be given wherever possible. In answering questions, those of a like nature will be grouped together and answered by one article. Every effort will be made to keep the answers simple and direct, yet fully self-explanatory. Questions should be addressed to Editor, " The Grid," Radio Broadcast, Garden City, N. Y.
Adding Audio Amplification to the R. B. One-Tube Reflex
/ have built the one-tube reflex set described in the November Radio Broadcast, and I must say it is a wonderful little set. I should like to add one stage of additional audio amplification to it, and should appreciate your showing me just how it is done. I should like to use filament control jacks, as one of this type is already in the single tube set.
R. O. O., New York City.
THE accompanying diagram Fig. i shows the connections for addingone stage of exterior, or straight audiofrequency amplification to the singie-tube reflex set. Filament control jacks, of the most easily obtainable type, have been indicated, but readers not possessing jacks of this design may use any other type that will accomplish the same thing. The reader having any doubt concerning
the connections for the particular type of jack which he finds it necessary to employ, is advised to read the article on "Jacks and How to Use Them" appearing in the April Radio Broadcast. Of course, straight double-circuit non-filament-contrcl jacks may be used if desired, the filaments being turned off by a switch, if a balance resistance such as the "Amperite" is used, or by a rheostat, which acts as a switch when in the "off" position.
Observant readers may notice that the positions of the telephone receivers and the "B" battery have been reversed. The reason for this is explained in the amplification article in the July Radio Broadcast, which readers desiring to add amplification to any set, will find it worth while reading. The diagram is otherwise quite selfexplanatory. Any well known and reliable amplifying transformer can be used. This one additional stage will probably be ail that will ever be desired on this remarkable little set.
FIG.
One stage of audio added to the one-tube reflex set. Note the position of telephones and "B" batteries