Threshold Howl
"THE following are a list of suggestions to cure the above trouble: 1. Reduce filament voltage of detectors valve. 2, Change value of detector grid leak. 8. Connect grid leak of 1 or 2 megohins across secondary of transformer. 4, Change transformer. In general, a cheap make will be less likely to cause threshold how] than an expensive one. 5. Use filter output circuit, for ‘phones. 6. Connect condenser of .0005 or .001 across ‘phones. , if Connect H.F. chokes in each ’phone ead. 8. Use capacity copling for aerial. ciycuit instead of loose inductive coupling. It may be necessary to try more than one ot the above "cures" to stop the owl.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19290524.2.92
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Radio Record, Volume II, Issue 45, 24 May 1929, Page 39
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114Threshold Howl Radio Record, Volume II, Issue 45, 24 May 1929, Page 39
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