Fitting Gramophone
a Precaution with Super-Het. — PROPOS the fitting of a gramophone pickup to a superheterodyne receiver, we have received a note from .an Auckland firm pointing out difiiculties. "While fitting the pickup after the _ detector is a possible way to achieve the desired result, it involves certain difficulties in the way of construction. If it is to be made a permanent device, as is most likely, difficulties the alignment of the 175° kilocycle "i. F. transformer will obviously arise. ~The permanent alteration must be fitted to ‘the low potential end of the grid circuit, and the bias must be altered so that the detector valve may function as an amplifier." This is no job for -.the amateur, ‘who should contact his agents before anything of the nature is done.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310814.2.7
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Radio Record, Volume V, Issue 5, 14 August 1931, Page 2
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130Fitting Gramophone Radio Record, Volume V, Issue 5, 14 August 1931, Page 2
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