Detecting Oscillation
Use of a Milliammeter ERY few people who have a milliammeter which will satisfactorily read between 0 and 10 milliamperes realise that it can provide a very interesting and certain indication of oscillation. One cannot be too certain that a set is not oscillating, because apart from the question of upsetting the reception of others, oscillation will cause distortion. The meter is connected in the plate circuit of the detector valve, somewhere between the plate and the H.T. + lead. It must not, however, be in a common H.T. + lead. With detectors using a grid leak and condenser, as soon as the set bursts into oscillation, or gradually builds up towards oscillation, so the needle of the milliammeter will jerk to a lower reading or gradually fall, as the case may be.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290927.2.80
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Radio Record, Volume III, Issue 11, 27 September 1929, Page 27
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133Detecting Oscillation Radio Record, Volume III, Issue 11, 27 September 1929, Page 27
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