Quote:
Originally Posted by Hartley118
Rather than the common 4mm plugs, wander plugs are 3mm.
Not sure what caused this handy size to go obsolete.
Martin
|
I was told that use was discouraged, and perhaps actually prohibited, because the plugs fitted the mains voltage selector on some sets.
One common type of mains voltage adjustment used a small 2 pin plug, with the 2 pins connected together. By inserting the plug into different combinations of holes, differing tappings on a transformer or dropper resistance could be selected.
Connecting a speaker to these connections could be most dangerous.
The larger 4mm plugs were I believe also banned for domestic equipment because the plugs fit European mains sockets.
4mm plugs are still used in labs and workshops, but are not allowed on new domestic appliances.