Stepdown transformer 240v - 220v

"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

How old is the amp ? Europe has been 230V, not 220V, for the past 15 years. If it works with 230V, it will have absolutely no problem working with 240V (hey, I measure 236V at my AC outlet most of the time).

Hi Elberoth
The amp is from the mid 90s , 1996 i believe ,
it has 220v stamped on the back , this is a review link to the amp in question.
http://www.tnt-audio.com/ampli/pa100_e.html
The amp is Italian -A.M.Audio PA-100.

Cheers
Phil.

Phil,

I wouldn't worry too much about that. There are thousands of amps on the market in Europe, that were made with 220V in mind. Now we have 230V (which means that allowable voltage is deviation is 207-242V, according to the +5%/-10% rule) and you do not hear about the older stuff suddenly breaking.

Measure the voltage across your AC lines, and if it is less than 240V, I wouldn't worry one bit.