Valve Protection
WHENEVER constructing battery sets provision should always be made for a fuse to protect the valves in ease of an accidental short-circuit. The best place to insert this is between "A-"’ and "B-," which are usually joined inside the set. This wire should be broken and a flashlamp bulb holder. complete with bulb, should be wired in the break. Be careful, however, that you use a flashlamp bulb and not one of the heavy torch bulbs, which will take anything up to half an amp, and which will consequently not burn out before your valves.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19320108.2.36
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Radio Record, Volume V, Issue 26, 8 January 1932, Page 13
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97Valve Protection Radio Record, Volume V, Issue 26, 8 January 1932, Page 13
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