QFTEN when: results from a set fali off after a year or two’s use it is not the set which is "wearing out," but simply the valves which are losing emission.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19310220.2.46
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Radio Record, Volume IV, Issue 32, 20 February 1931, Page 15
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31Untitled Radio Record, Volume IV, Issue 32, 20 February 1931, Page 15
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