To Help the Constructor.
HE constructor should be thoroughly satisfied with the’new "Guide." Sets and accessories receive the fullest attention. Here are some of the excellent constructional features-crystal sets and amplifiers, the four-valve B.D., the B.D. with parallel feed, the Instage .R.F., B.D., the adapted screen grid B.D. (single dial control with trimmer), a two-foot cone, speaker, power transformers, A battery charger, B eliminator, and thedretical circuits of the most popular "Record" circuits, and including the A.C. Browning Drake and the A.C, neutrodyne.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290503.2.58
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Radio Record, Volume II, Issue 42, 3 May 1929, Page 31
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83To Help the Constructor. Radio Record, Volume II, Issue 42, 3 May 1929, Page 31
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