Welcome to Australia's only Vintage Radio and Television discussion forums. You are not logged in. Please log in below, apply for an account or retrieve your password.
Australian Vintage Radio Forums
  Home  ·  About Us  ·  Discussion Forums  ·  Glossary  ·  Outside Links  ·  Policies  ·  Services Directory  ·  Safety Warnings  ·  Tutorials

Tech Talk

Forum home - Go back to Tech talk

 Plethora of 'suicide plugs'
« Back · 1 · Next »
 Return to top of page · Post #: 1 · Written at 12:18:56 AM on 1 September 2023.
GTC's avatar
 GTC
 Location: Sydney, NSW
 Member since 28 January 2011
 Member #: 823
 Postcount: 6720

This is the most of these that I've seen in the one place in decades.

Opinions will vary but, personally, I'd be dumping them:

https://i.ebayimg.com/images/g/LkMAAOSwIeZk78O0/s-l1600.jpg


 
 Return to top of page · Post #: 2 · Written at 8:46:33 AM on 1 September 2023.
Brad's avatar
 Administrator
 Location: Naremburn, NSW
 Member since 15 November 2005
 Member #: 1
 Postcount: 7342

A handful for display purposes, I'd do that but there is no way I'd put one back into service, even for myself. All it takes is one strand to come from under the screw and poke out to the side for a shock to occur. At the age these plugs are at, the bakelite is also too thin to run them through the normal rigours of daily use and it is prone to cracking. That will hurt if one is pushing a plug into a socket at the time the plug falls apart.


‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾‾
A valve a day keeps the transistor away...

 
 Return to top of page · Post #: 3 · Written at 9:35:10 AM on 1 September 2023.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5303

In most cases the cable is either unsheathed figure 8, or its cactus no matter what it is; plus the regulation, now banned, cable knot.

The biggest issue with the Bakelite (noted over 60 years) is its rigidity, related to shock, causing breakage and in certain circumstance the fingers can touch the screws, or prongs. That is likely the reason for the mandatory insulation on the newer plug top prongs.

In the main most old sets here are transformer, so the cable is usually replaced here by a modern cloth covered suicide cable, or repurposed computer IEC cable after the IEC end is cut off. That results in a lead with a sealed plug top and a grounded chassis. With a grommet, etc meeting modern regulations for securing that cable.
One should note that if its a shielded transformer, it will put a charge onto the chassis. That has on the odd occasion caused hum. However, grounding the chassis gets rid of it.

What I consider dangerous, and wonder how they got into the country?

I have modified several Signal Generators and other transformer devices with metal cases and two wire mains cables, with the chassis and cabinet connected to that mains cable with a cap. There is always the risk, especially with old ones that the cap is not a proper line cap and could be on Active.

To me that is not intrinsically safe and really should have had a three wire mains cable when built.


 
 Return to top of page · Post #: 4 · Written at 7:21:40 PM on 1 September 2023.
DangerousDave's Gravatar
 Location: Toongabbie, VIC
 Member since 1 September 2020
 Member #: 2438
 Postcount: 131

Yes, these plug tops were outlawed in the fifties and should be busted up.


 
 Return to top of page · Post #: 5 · Written at 8:29:44 PM on 1 September 2023.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2405

And then there are those old double adapters that reverse active and neutral on each outlet.

Matsushita Electric's first product was a power plug made of wood. 100 volts AC in Japan not quite so dangerous I suppose.


 
 Return to top of page · Post #: 6 · Written at 9:23:25 PM on 1 September 2023.
Marcc's avatar
 Location: Wangaratta, VIC
 Member since 21 February 2009
 Member #: 438
 Postcount: 5303

There are woods that have a high dielectric strength and were used with electric fencing. One of my units is around 7KV.


 
 Return to top of page · Post #: 7 · Written at 8:00:00 AM on 2 September 2023.
STC830's Gravatar
 Location: NSW
 Member since 10 June 2010
 Member #: 681
 Postcount: 1284

Blackbean is an oily timber with a high electrical resistance.


 
 Return to top of page · Post #: 8 · Written at 12:57:48 PM on 2 September 2023.
Ian Robertson's Gravatar
 Location: Belrose, NSW
 Member since 31 December 2015
 Member #: 1844
 Postcount: 2405

Well I guess they must have been safe and no-one got killed because the company went on to be the behemoth we know today.
But life was cheap in those days LOL


 
« Back · 1 · Next »
 You need to be a member to post comments on this forum.

Sign In

Username:
Password:
 Keep me logged in.
Do not tick box on a computer with public access.