Ή το διάβασες βιαστικά Μια χαρά διαπιστώσεις κάνει ο άνθρωπος, διεκτραγωδώντας την αμέλεια πολλών κατασκευαστών. Π.χ.: "Hi-fi designers are ignorant enough of world AC realities. Many American designers don’t realise that their 60Hz transformers, which are 10% cheaper to make, are under stress when used on 50Hz mains (in the UK and EU-land), and the stress doubles when the voltage is remotely above rating" κλπ κλπ.