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Old 4th Jul 2020, 10:37 am   #21
lesmw0sec
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Default Re: Half wave mains rectification and live chassis

Are you by any chance the ex Neve chap I have had contact with by wireless?
The import thing was quite sensible. If you wanted to import stuff not being made in Aus. there was no duty to pay. (Most regs. in Aus. were logical, at least at the time...)
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Old 4th Jul 2020, 11:38 am   #22
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Default Re: Half wave mains rectification and live chassis

No I don't think we've had contact before. AWA had been a significant supplier of studio audio gear, but, interestingly, only on their homeground of Australia: decent kit but seemed costly to manufacture. We managed to displace them at Kerry Packer's Channel 9 TV station.

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Old 4th Jul 2020, 12:00 pm   #23
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Default Re: Half wave mains rectification and live chassis

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Originally Posted by lesmw0sec View Post
The only thing that got my goat in Australia was the fact that (in theory) I was not allowed to do house wiring although I was considered competent to design and install a 3Ph power supply for a TV transmitter. I got over the wiring regs when we moved to the bush and having my own generator, was deemed to be the electricity 'authority'!
Not anymore and if you live in Queensland, technically, your not allowed to even fit a mains plug to something like a TV (actually, anything) without a limited license.
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Old 4th Jul 2020, 12:22 pm   #24
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Default Re: Half wave mains rectification and live chassis

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No I don't think we've had contact before. AWA had been a significant supplier of studio audio gear, but, interestingly, only on their homeground of Australia: decent kit but seemed costly to manufacture. We managed to displace them at Kerry Packer's Channel 9 TV station.
We did supply some stuff via AWA (re-badged) They were quite a good company to deal with. My claim to fame is the design for the first mixer installed in the opera house! Most of our kit (MTE) was supplied direct to the customer.
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Old 4th Jul 2020, 3:03 pm   #25
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Default Re: Half wave mains rectification and live chassis

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My claim to fame is the design for the first mixer installed in the opera house!
A distinguished claim to fame!

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Old 11th Jul 2020, 12:45 am   #26
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Default Re: Half wave mains rectification and live chassis

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Whatever the reason might have been, even the penny pinchers at Philips went through the trouble of redesigning the non-isolated buck converter powersupply of their 1972 K9 colour sets for the AU/NZ market to use an isolation transformer instead of just a coil. Basically the same circuit, I think, but slightly more expensive to manufacture.
In the NZ case, I think it was a regulatory requirement. I have a vague notion that the rules about the electrical safety of TV and radio receivers and other appliances were tightened up at about the same time that colour TV was introduced. I think it was something in the nature that appliances had to be Class I (with a 3-core power lead) or Class II (double-insulated and completely enclosed), with Class 0 and Class I0 outlawed. Philips had previously slipped in some monochrome valve TV receivers and some valve radio receivers of the live chassis type, but these were a minority as the prevailing approach had been to use double-wound power transformers and 3-core power leads.


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Old 11th Jul 2020, 12:59 am   #27
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Default Re: Half wave mains rectification and live chassis

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The other thought is that a lot of immigrants from the UK to here and to Aussie brought along their own household electrical goods as they could be quite pricey - so that's another avenue as there were no inspections.
I think that happened quite a bit. For example, my late father took a new Bush EU24 (AC/DC) from the UK to NZ in 1951. An EBS24 (proper isolated power supply) would have been a better choice for NZ (which was virtually all AC domestic reticulation by then, except for a small part of central Auckland) but he was given a bum steer by the retailer, who was supposedly a personal export specialist. The irony was that he was headed to the Waikato hydro development project construction town, all new AC reticulation of course. He did mention that he was once told by an electrical engineer that strictly speaking, that receiver was not allowed by the local reticulation organization, I think (but am not sure) that it was because of the DC component rather than safety, although it was actually unsafe in that you could easily stick say a knitting needle through one of the back ventilation slots and reach the live chassis.


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Old 17th Jul 2020, 6:38 pm   #28
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Default Re: Half wave mains rectification and live chassis in Australia and New Zealand?.

Thanks Synchrodyne - you've given me a mental image of some dear old lady poking through the back of her beloved Bush set and suffering the results. Had me in fits. Mind you things like that DID happen - my Gran had a good friend whose new electric toaster was a bit 'sticky' so she used to poke down the side of the toast with a knife to loosen it up - was OK for some time as she used a bone handled knife - but one day she picked up a metal handled knife to dig the toast out. They found her the next day with the knife still clutched in her hand - poor soul.
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Old 18th Jul 2020, 12:30 am   #29
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Default Re: Half wave mains rectification and live chassis in Australia and New Zealand?.

I have talked about this before!! I'm 67 years old, been in the trade all my life ( although I went into mainframes and away from TV and radio very early in the piece) and I have yet to see a hot chassis radio or TV set. We didn't have TV at all while I lived at home, simply because it didn't exist. ( didn't have a telephone either) It wasn't until about 1965 or so ( I can be corrected on that) that TV came to Canberra, and living in Cooma 70 road miles away, required huge antenna systems, with associated guy wires holding up 12 mtres of 2" water pipe.

Joe
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Old 18th Jul 2020, 2:14 am   #30
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Default Re: Half wave mains rectification and live chassis in Australia and New Zealand?.

I had to look up "reticulation", it turns out it's a particularly Antipodean word in the context of utility networks.
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Old 18th Jul 2020, 9:01 am   #31
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Default Re: Half wave mains rectification and live chassis in Australia and New Zealand?.

Yes I was confused by it on a trip to Western Australia a couple of years ago when it was frequently used with reference to water irrigation systems.
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Old 18th Jul 2020, 5:25 pm   #32
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Default Re: Half wave mains rectification and live chassis in Australia and New Zealand?.

Indeed, "reticulation" is a term used overseas for the final distribution of any utility, most commonly electricity, but can also apply to gas or water.

The use of fixed distribution equipment is implied. I don't think that bottled gas distributed by truck counts as "reticulation"
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Old 19th Jul 2020, 4:14 pm   #33
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Default Re: Half wave mains rectification and live chassis in Australia and New Zealand?.

I seem to remember that 'reticle' or 'reticule' is another word for a graticule, a set (grid?) of lines in an optical instrument used for measurement. I assume it has a similar origin
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Old 19th Jul 2020, 5:31 pm   #34
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Default Re: Half wave mains rectification and live chassis in Australia and New Zealand?.

Repetition would seem to have the same root.
 
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