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From: N_Cook on 3 Jun 2010 05:30
Ron <ron(a)lunevalleyaudio.com> wrote in message
news:z5KdnW0VXPQ_7prRnZ2dnUVZ8hKdnZ2d(a)bt.com..


> Multitap?


You can have multitaps on dual primary ones for variants on the theme of
110/240V, so not an exclusive term




From: Grant on 3 Jun 2010 05:45
On Thu, 3 Jun 2010 09:12:07 +0100, "N_Cook" <diverse(a)tcp.co.uk> wrote:

>Grant <omg(a)grrr.id.au> wrote in message
>news:tkne06ltbli2a5aij6qc112iti0ed8tntp(a)4ax.com...
>> On Thu, 3 Jun 2010 08:27:03 +0100, "N_Cook" <diverse(a)tcp.co.uk> wrote:
>>
>> >Cydrome Leader <presence(a)MUNGEpanix.com> wrote in message
>> >news:hu6geg$qkj$1(a)reader1.panix.com...
>> >> N_Cook <diverse(a)tcp.co.uk> wrote:
>> >> > About year 1999, USA make, for export
>> >> > In line , not 2 or more separate primary windings, DC ohms to nearest
>> >0.1
>> >> > ohm. I'm assuming same gauge wire throughout
>> >> > Labelled by me as A,B,C,D,E crossplot (message souce maybe equispaced
>> >font)
>> >> >
>> >> > --- A B C D E
>> >> > A --- 9.2 8.5 12.5 1.5
>> >> > B 9.2 --- 0.6 3.6 7.6
>> >> > C 8.5 0.6 --- 4.2 7.6
>> >> > D 12.5 3.6 4.2 --- 11.1
>> >> > E 1.5 7.6 7.6 11.1 ---
>> >> >
>> >> >
>> >> > Would D-E / D-A be 220/240Vac or 230/250V ac?
>> >> > what would likely be the 110 or 130V interconnctions option ?
>> >> > Other than checking using a variac , any other tips ?
>> >>
>> >> you never mentioned what you're even talking about, or what it's from.
>> >>
>> >> Assuming it's something like an "international" linear power supply,
>there
>> >would be
>> >> windings for 100, 120 220 and 240 volts based off a combination of
>> >terminals. US made
>> >> transformers for domestic only use would generally max out at 3 or 4
>> >terminals for
>> >> 120/240 use.
>> >>
>> >> here's a diagram of how these international transformers work:
>> >>
>> >>
>>
>>http://www.slpower.com/Upload/Technical/20070404102642455201154_41-32512F_M
>L
>> >_Series.pdf
>> >
>> >
>> >That transformer type is the 2 separate primaries, not the subject of
>this
>> >thread.
>> >Does anyone have the generic name for these wasteful construction made in
>or
>> >for USA , for export kit ? the ones with a (electrically) continuous
>single
>> >primary winding
>> >
>> Autotransformer.
>>
>> What results from driving the secondary with a low voltage?
>>
>> Grant.
>> --
>> http://bugs.id.au/
>
>
>My understanding of the term autotransformer is primary and secondary
>electrically continuous, ie no electrical isolation
>
You're not looking for answers, are you?

Grant.
--
http://bugs.id.au/
From: David Nebenzahl on 3 Jun 2010 14:15
On 6/3/2010 2:45 AM Grant spake thus:

> On Thu, 3 Jun 2010 09:12:07 +0100, "N_Cook" <diverse(a)tcp.co.uk> wrote:
>
>> Grant <omg(a)grrr.id.au> wrote in message
>> news:tkne06ltbli2a5aij6qc112iti0ed8tntp(a)4ax.com...
>>
>>> What results from driving the secondary with a low voltage?
>>
>> My understanding of the term autotransformer is primary and
>> secondary electrically continuous, ie no electrical isolation
>>
> You're not looking for answers, are you?

He rarely is. Just sitting at the bar bending the ears of whatever poor
saps sitting nearby are willing to listen to his ramblings.


--
The fashion in killing has an insouciant, flirty style this spring,
with the flaunting of well-defined muscle, wrapped in flags.

- Comment from an article on Antiwar.com (http://antiwar.com)
From: Cydrome Leader on 3 Jun 2010 17:25
N_Cook <diverse(a)tcp.co.uk> wrote:
> Cydrome Leader <presence(a)MUNGEpanix.com> wrote in message
> news:hu6geg$qkj$1(a)reader1.panix.com...
>> N_Cook <diverse(a)tcp.co.uk> wrote:
>> > About year 1999, USA make, for export
>> > In line , not 2 or more separate primary windings, DC ohms to nearest
> 0.1
>> > ohm. I'm assuming same gauge wire throughout
>> > Labelled by me as A,B,C,D,E crossplot (message souce maybe equispaced
> font)
>> >
>> > --- A B C D E
>> > A --- 9.2 8.5 12.5 1.5
>> > B 9.2 --- 0.6 3.6 7.6
>> > C 8.5 0.6 --- 4.2 7.6
>> > D 12.5 3.6 4.2 --- 11.1
>> > E 1.5 7.6 7.6 11.1 ---
>> >
>> >
>> > Would D-E / D-A be 220/240Vac or 230/250V ac?
>> > what would likely be the 110 or 130V interconnctions option ?
>> > Other than checking using a variac , any other tips ?
>>
>> you never mentioned what you're even talking about, or what it's from.
>>
>> Assuming it's something like an "international" linear power supply, there
> would be
>> windings for 100, 120 220 and 240 volts based off a combination of
> terminals. US made
>> transformers for domestic only use would generally max out at 3 or 4
> terminals for
>> 120/240 use.
>>
>> here's a diagram of how these international transformers work:
>>
>>
> http://www.slpower.com/Upload/Technical/20070404102642455201154_41-32512F_ML
> _Series.pdf
>
>
> That transformer type is the 2 separate primaries, not the subject of this
> thread.
> Does anyone have the generic name for these wasteful construction made in or
> for USA , for export kit ? the ones with a (electrically) continuous single
> primary winding

You're right- they must have just cheapened their transformers. Condor
stuff used to have the 5 terminal primary windings. If you can find a
manual for an older generation "international linear power supply" how
those windings are setup is diagrammed.

They're not a single winding though, and not nearly as wasteful as 50Hz
mains frequency when it comes to excessive use of materials and size.

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