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Old 12th October 2012, 11:50 PM   #11
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by DF96 View Post
Those IEC power input/output sockets are perfectly normal and standard in Europe. The cables are widely available over here.
We're not exactly an IEC backwater over here either..
They're quite readily available from most electronic component suppliers, and at hamfests.
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Old 13th October 2012, 10:33 AM   #12
DF96 is offline DF96  England
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Sorry, I was not certain how widespread they are elsewhere. Clearly the OP thought they were exotic. The fact that they are widely used for computers should have alerted me.
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Old 16th October 2012, 10:35 PM   #13
rize is offline rize  United States
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Thank you. I found the pig-tail IEC male/female adapters on eBay.
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Old 16th October 2012, 11:45 PM   #14
rize is offline rize  United States
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I understand an iso traf connects two separate transformers magnetically. In this particular Toroid traf, the isolated side's neutral is not grounded. Let's assume by mistake it was. For the example of a 2-prong classic radio, plugged into the Toroid iso-traf, what is the risk for a DIY'er who has taken precations of not grounding himself?
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Old 17th October 2012, 11:34 AM   #15
DF96 is offline DF96  England
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'connects two windings magnetically' not 'two transfomers'

If the output from an isolation transformer is grounded on one side then connected to an AC/DC radio then you have largely undone the benefit of isolation unless you can guarantee that you have grounded the 'chassis' side. The only benefit you get is a higher impedance supply so possibly a bit less 'shock' current.
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Old 17th October 2012, 12:36 PM   #16
AndrewT is offline AndrewT  Scotland
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For an isolation transformer, the secondary/output must NOT be connected to Neutral/Earth/PE.
The output MUST float.
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Old 17th October 2012, 10:22 PM   #17
rize is offline rize  United States
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Default Toroid iso-traf upgrade

Quote:
Originally Posted by kevinkr View Post
I've got a 600VA and a 1kVA made by Toroid Corp of Maryland, the maker of your unit. The company is very much still in business, in fact we have a bunch of these at work. (I work in medical electronics.) Note that the output is floating and interestingly I found that the overall hum level in my system decreased very slightly.
Thanks... when I read this I gathered the courage to violate Naim's rules - i.e., not to plug a Naim unit into any noise supression unit.

I plugged my integrated amp (Naim Nait-1) into the Toroid iso-traf, the noise drop was significant. There was more music and information - I had to turn it louder. Naim's line-stages have too much noise. Nait-1 is 80's technology but one shoe-size box can surprise you. When it came out it sold for $400-500 but now you're lucky if you can get one on eBay for less than $800. Naim will emphasize selling their customers expensive external PSU upgrades - clever marketing that have made them millions.

The difference I heard with the Toroid iso-traf (much cheaper than a Naim PSU) was at least as good as adding an external Naim PSU which sells used/new between $700-1500. Nait-1 is not upgradable by a separate Naim PSU but more modern Naim pre-amps and cd players are. With Nait-1, it's possible to upgrade the internal monolithic power regulation circuit with a super-regulator. Naim recommends against noise-supression, filters, etc claiming it will degrade or change the sound. Well with Toroid iso-traf plugged in, Naim's unmistakable PRAT is still there and grooving better than ever. To my ears it sounds as good if not better as adding one of their Hi-Caps (external PSU) - maybe it's the psycho-acoustic effect of paying less and getting something in return .
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