Dodgy step down tranny

"Sylvia Else" <sylvia@not.here.invalid> wrote in message
news:8rea5mFk3oU1@mid.individual.net...
On 9/02/2011 12:37 PM, Phil Allison wrote:
"kreed"

The size of the case is irrelevant, they could shove a very small
transformer inside
you need to see the internal transformer to make such a judgement.


** Err - the weight might be a good guide.

The unit I have here weighs just under 3.8 kg including the attached
lead.

Then it's not the same as the 2kW version on the website, which weighs
12.5 kg. Indeed, it has a similar weight to the 500W version.

Perhaps there's a QA problem with labelling.

Sylvia.
Even at 12.5kg I doubt the 2kW rating is genuine. I have a 1kW rated
isolation transformer which weighs in at over 16kg - and that isn't in a
case. Admittedly, mine is not a toroidal but the variation in weight for a
supposed 2kW toroidal versus a 1kw E-I tranny is still an indication of lack
of truthfulness in the rating for this tranny.
 
"Ross Herbert"

Even at 12.5kg I doubt the 2kW rating is genuine.

** A 2kVA toroidal *auto-transformer * uses the same core size as a 1300 VA
isolation type.

Makes the weight around 11kg plus box.

The stupid thing is the 110 volt rating - which suits neither the US or
Japan.

And if they deliver only 100 volts or so ON LOAD - like the one I have
ere - they are suitable for Japanese local market gear only.

The valve amplifier that came with that " dodgy step down " loses 40% of its
normal output power when used this way.


...... Phil
 
Sylvia Else wrote:

On 9/02/2011 12:55 PM, Trevor Wilson wrote:
[...]
**The mass SHOULD be a giveaway. However, I've worked on more equipment
than I care to think about, where the manufacturer (usually Chinese) has
incorporated large pieces of non-structural steel to increase the mass of
the product. I've even seen all-aluminum chassis devices, where steel has
been used to increase mass. The first time I saw this done, was with an
Onkyo (Japanese) CD player, back in the 1990s. The CD player weighed in
at a hefty 25-odd kg. More than half that mass was the result of a large
piece of steel bolted to the base plate. Without opening the player, an
owner would never realise that it was the reason for all that mass.

Seems an odd thing to do with a CD player, given that I wouldn't have
thought a consumer would expect it to be particularly heavy - and
certainly not 25kg heavy.
Early CD players had sprung feet and a large ballast to damp vibrations. As
electronics got better & tracking became more reliable the manufacturers did
away with it.

I have an early Kenwood player here built that way. I wonder if it was a
case of the high end auto manufacturers translating their experience with
turntables into the new fangled CD players.

Bruce
 
"Bruce Kook"

Early CD players had sprung feet and a large ballast to damp vibrations.
** Only a tiny few models had any such nonsense.

As electronics got better & tracking became more reliable the
manufacturers did
away with it.
** Horse manure.


I have an early Kenwood player here built that way. I wonder if it was a
case of the high end auto manufacturers translating their experience with
turntables into the new fangled CD players.
** Pure marketing hype.




...... Phil
 
On Feb 15, 11:28 am, Bruce Cook <bruce-
use...@noreplybicycle.synonet.comnoreply> wrote:
Sylvia Else wrote:
On 9/02/2011 12:55 PM, Trevor Wilson wrote:
[...]
**The mass SHOULD be a giveaway. However, I've worked on more equipment
than I care to think about, where the manufacturer (usually Chinese) has
incorporated large pieces of non-structural steel to increase the mass of
the product. I've even seen all-aluminum chassis devices, where steel has
been used to increase mass. The first time I saw this done, was with an
Onkyo (Japanese) CD player, back in the 1990s. The CD player weighed in
at a hefty 25-odd kg. More than half that mass was the result of a large
piece of steel bolted to the base plate. Without opening the player, an
owner would never realise that it was the reason for all that mass.

Seems an odd thing to do with a CD player, given that I wouldn't have
thought a consumer would expect it to be particularly heavy - and
certainly not 25kg heavy.

Early CD players had sprung feet and a large ballast to damp vibrations. As
electronics got better & tracking became more reliable the manufacturers did
away with it.

I have an early Kenwood player here built that way. I wonder if it was a
case of the high end auto manufacturers translating their experience with
turntables into the new fangled CD players.

Bruce
CDM12 still has spring feet on it.
 

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