Tightening Valves
é PULLING a valve out of its socket 4 by the bulb may not appear to harm it, but in time there is a possibility that it will work loose from its base. If you haye a valve whose bulb has been loosened in this way, you can strengthen it by binding sticky insulating tape over the bulb and the valye-base where these come together,
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https://paperspast.natlib.govt.nz/periodicals/RADREC19311231.2.18
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Radio Record, Volume V, Issue 25, 31 December 1931, Page 5
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67Tightening Valves Radio Record, Volume V, Issue 25, 31 December 1931, Page 5
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