Stepdown transformer 240v - 220v



Hi Guys
I have a integrated amplifier that is set for 220v European and i need to use it on a 240v outlet here in Australia , the amplfier transformer is rated at 500va and the amp is 100wpc into 8ohm
what size stepdown transformer would i need ?
i have seen a stepdown that is rated at 600w - 2.7 amps
and a 1000w - 4.5amps .
I wish to maintain the best sound from the amp and don't want to restrict its power supply .
sorry but i am a bit of a nuff with electronics.

Thanks for your help

Phil.

Regards
Phil
steam3642
Post removed 

Thanks for the link Elizabeth
starting to get my head around the workings of stepdowns
my main concern is getting a stepdown unit that will not bring a audible reduction in dynamics hence my confusion as to what size to buy , I am not much of a electronics man
just a enjoy the music kinda guy :)

Cheers
Phil.
Tasmania . Aus
These are the bomb, will do 240 or 220 at the push of a button on the front panel and regulate voltage. I have one , good stuff.

http://thortechnologies.com.au/products/product/ps10-smart-power-station
"What is the difference...?"

Between the Tortech and the Signal SU/DU at 2000 watts, about 20 kg and several hundred dollars.

An autotransformer only has one winding and offers no isolation and no filtration. They are more efficient per weight and cost. If you want a packaged unit, that may be the only option available.

The mass of bigger core with dual/quad windings does give it some magnetic stability, if I'm using that term properly.

Bandwidth is not an issue for power transformers, unlike audio. They only have to provide 50 or 60 Hz. In fact, the narrower the better.

As far as degradation, there are various opinions and experiences and I can't account for each implementation although I've seen some that were just wrong. I've got several oversized isolation and center-tapped (don't ask) transformers and haven't heard any degradation, just a bit less noise. Not a big proponent of using them for amps because of the way a class AB amp draws power in spikes, but as long they're sufficiently oversized, it shouldn't hurt.

Be aware too that transformers can have a mechanical hum that can be unpredictable to each installation and environment.

Thanks Ng
Will look to purchase a Tortech unit
as they are local here in Australia and at around $200
affordable .

Cheers
Phil