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In Reply to: RE: Enlighten me ... posted by kendodsdadsdogsdead on October 30, 2014 at 13:11:20
In the United state we have polarized two prong plugs. One prong is wider than the other, so you cannot plug it in the wrong way. On equipment where it doen't matter, we have non- polarized 2 prong plugs, where the blades are the same. 3 pronged plugs are always polarized. The picture above is a polarized two prong plug. Note the different sized blades. All modern outlets are sized for polarized blades. A non polarized plug will fit in them either way. A polarized plug will not fit in the older non-polarized outlets either direction. No danger there.
Dave
Follow Ups:
Yes Dave, Hallelujah.! The 517 (and thousands of other things) was made in the late 70's, early 80's. If they had 2-core mains cables then they would have had non-polarized plugs because it did not matter - and still does not matter which way round they're connected. It didn't matter 35 years ago and it doesn't matter now. The Russian guy who initially asked the question obviously doesn't know much at all about electricity - that's why he asked. The answer you gave him was misleading to say the least. You seemed to forget that he was asking about a 35 year old amp, with 2-core mains cable that could have only been manufactured with a standard non-polarized plug. How about all those old amps from the 60's, 70's & 80's..? That row of AC outlets on the back with standard US 2-pin sockets. Does it matter which way round these are connected..? No it doesn't.
The Sansui amp and tuner that I have (AU-222 and TU-666) from the early 70's do have non polarized plugs. So in the case of the AU-517 I think you are correct that there is no danger. Since the Japanese receiver I saw self destruct when its polarized plug was reversed, was from the late 70's, for the US at least, I can't say it is safe for all receivers. US spec receivers do not usually have multi voltage, so they are not usually the same as what you get in Great Brittan, even if the model is the same, so I can make no claims about them.
Dave
Dave... I have schematics for US, European & Export models. They're all double insulated so it never mattered which way round the factory fitted non-polarized mains plug went.
Basically, all the advice given by other people on this forum to the Russian guy was incorrect and based on either jumping to conclusions, a hunch or some story told by someone years ago about a guitar amp with a death cap.
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