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Step down transformer (220V to 100/110V) or buy 220V version of Shindo preamp

I really need to buy a Shindo preamp. a) Should I go for a original 220V Shindo preamp (harder to obtain, no local Shindo dealer here) or  b) get a 110/100V version from USA/Japan and use a step-down transformer c) Or get the Shindo dealer to alter the 110V to 220V.

questions:
1) At this level, is there sound degradation if I use a step down transformer?
2) The Shindo dealer will change the 110V to 220V but it will be done by a US tech not Shindo, I wonder if it will lead to some loss. Since soldering and change of resistor will happen. If that's the case I might just buy the 110V version from him.

Any thoughts on using step down transformer in general, does it lead to sound degradation?
essrand

Showing 5 responses by erik_squires

erik_squires
16,592 posts
 
Other brands of balanced power include Furman and Tripp Lite, but the latter is usually the inexpensive kind.

There is nothing at all wrong with autotransformers by the way. They just don't have the noise blocking of a fully balanced unit.

Best,

E
erik_squires
16,592 posts
 
Equi Tech is the name most often seen in audiophile circles, not sure if they have step up / step down versions, but worth checking... :)

They are much more expensive than the autotransformer version due to the raw materials involved.

But also use google. I found an interesting link like this one:

http://www.6moons.com/audioreviews/240_117/240_117.html



Best,

E
erik_squires
16,592 posts
 
@essrand

The type of transformer matters. Most step down transformers are also called autotransformers. They use a single winding to convert the voltage from 220 to something less.  More here:

https://en.wikipedia.org/wiki/Autotransformer

A balanced transformer has 2 separate windings, which offers better noise isolation and some ground loop isolation.

Best,

E
erik_squires
16,592 posts
 
About sound, if you use a fully balanced transformer, you may actually improve the overall sound quality.

Best,

E
erik_squires
16,592 posts
 
If you want a transformer that has 120VAC at the inputs, then you want a step-up transformer. :)

If you want a transformer that has 220VAC at the inputs and provides 120VAC to the pre, you want a step-down.


Best,

E
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