Mnem... It's hard to know without a 1955 twin lead only usa cable mount socket - the surplus sales socket will need a bit of bodge-ing - it looks too big as is but it is closer than I have at present.
Hi Rob - I just looked at mine in hopes of providing some insight. I can't - they have fixed power cords with bog standard strain reliefs. If it could be fitted without too much filing and hacking, if I were in your shoes I'd put in a regular IEC C14 mains connector.
-Pat
Thanks guys, the internal diameter is 25mm, the male connectors are 12.5mm apart from each other and centred in the hole, they are equal size at 6.3mm, ie all non metric. Is this is the old USA standard? (it was made in 1955).
I think I have found an iec chassis 'plug' that will fit with minimal /no panel work - if not, I will try either a cord bodge or a mock replacement mini-panel with a fixed cord - strain relief etc.
I will have to wait for bits to turn up in the antipodes!
-Rob
It looks a lot like the connector in pictures 5&6 would fit, on this useful site for old electrical fittings;
https://www.plugsocketmuseum.nl/NorthAm2.html
And why didn't you measure it in inches, I have checked a modern US cord I have here and the blades of the plug are 1/2 inch apart (12.7mm) & 1/4 inch wide (6.35mm).
Homepage for the plug socket museum website:
https://www.plugsocketmuseum.nl/Overview.html
David
Yup; that socket is the non-polarized version then. Like I said, it was hard to tell from the photo.
Those measurements match with US standard of 1/16" x 1/4" (nominal; thickness varies a bit) blades spaced 1/2" apart (center to center). This part of the standard has not changed; only the width of the NEUTRAL blade has changed for the sake of polarization. Even on grounded plugs, the standard is still 1/4" x 1/16" sized blades.
It's hard to say for sure then on the cord-end socket from Surplus Sales; guessing from the photo it Looks bigger than 1" nominal/25mm OD, but again, that's just a guess.
![Confused :-//](https://www.eevblog.com/forum/Smileys/default/confused0024.gif.pagespeed.ce.5xOqKkq0Co.gif)
Personally I'd still hack my cord from a grounded extension like the one I showed, just so I could mod the cord with a brush contact to make the chassis grounded. But that wouldn't look as good as an original molded cord. It's a tough call; neither choice presents an optimal appearance, and the OEM cord will be pretty much unobtanium unless you get crazy lucky at a hamfest or flea market and find a 50-year-old vacuum-cleaner cord in usable condition.
*Light dawns*
You know... that MAY be a source for you. Vacuum cleaners were by far the largest users of this type of socket;
you may be able to find a cord locally from a vacuum cleaner repair shop. I know from experience that when I need an extra long cord for test equipment, that's where to go.
Electrolux used to use 16/18ga 2-wire and 3-wire cords that match the IEC profile on many models; they're still available as new manufacture in 25/30/50 foot lengths. And available in straight or right-angle on the socket end. ![ThumbsUp :-+](https://www.eevblog.com/forum/Smileys/default/icon_smile_thumbsup.gif.pagespeed.ce._JElyJQqdB.gif)
mnem
*currently having a sordid and unnatural affair with his morning cup of coffee*