TE your soldering iron is not proper "~~ ly heated when soldering to tere minals on a ,transformer or. similar ‘component, you, may melt the connections inside the instrument and find it extremely hard to renew them.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310410.2.64
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Radio Record, Volume IV, Issue 39, 10 April 1931, Page 31
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36Untitled Radio Record, Volume IV, Issue 39, 10 April 1931, Page 31
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