Figure 8. A midget condenser of about 300 mmfd. can be used as a tone control. The condenser is connected directly across the secondary of the audio transformer, or across the grid leak in a resistance coupled amplifier.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310710.2.41.3
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Radio Record, Volume IV, Issue 52, 10 July 1931, Page 17
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38Figure 8. A midget condenser of about 300 mmfd. can be used as a tone control. The condenser is connected directly across the secondary of the audio transformer, or across the grid leak in a resistance coupled amplifier. Radio Record, Volume IV, Issue 52, 10 July 1931, Page 17
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