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Many radios use a two-pin chassis-mounted mains connector having a special design. Many allow the mains lead to be plugged in either way round and, of course having only two pins, have no safety earth. Let's pause at this point to consider AC/DC sets. These require careful consideration because of the problem of a live chassis and so fitting an IEC connector will not be as straightforward as is the case of an AC set. If in doubt do not proceed to modify an AC/DC set. If you do proceed then do so having carefully considered all aspects of electrical safety. If you don't know how to identify an AC only or an AC/DC set you should not even consider handling an old radio. Having mentioned WW2 military radios I'll briefly discuss these and also those using valves that were made up to around 1970. You'll have surely noticed that modern mains plugs have an earth pin which is longer than those used for live and neutral. This is to ensure that any exposed metalwork is connected to the safety earth connection before live or neutral connections are made. If the earth pin isn't longer then the odds are that grasping a case and inserting the mains lead will be a painful experience. One option is to never unplug the lead.. another is to only plug it in before the 13 amp plug is inserted into the mains. A better option is to replace the offending plug/socket pair with an IEC plug/socket. One such radio might be a Murphy 62B Receiver which uses a Plessey style mains plug carrying three pins having the same length. |
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