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Old 05.10.2009, 17:38
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Step-down transformers: Clean enough for HiFi?

Does anyone have experience in using 220v to 110v step-down transformers with Hi-Fi? Is the output clean enough to avoid hum in the audio output? I'm not talking about those cheap thyristor devices; I'm referring to the large, heavy transformers for $100 or so.

I was prepared to replace my gear in CH but now I'm realising that a basic $250 A/V receiver is 500CHF or more. German prices aren't any better, it seems.
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Old 05.10.2009, 17:40
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Re: Step-down transformers: Clean enough for HiFi?

you're also factoring in the hummmmm from the 2000w step-down transformer too?

Where will you be placing your small, heavy box?
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Old 05.10.2009, 17:45
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Re: Step-down transformers: Clean enough for HiFi?

somewhere far away, hopefully.
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Old 05.10.2009, 17:46
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Re: Step-down transformers: Clean enough for HiFi?

I brought a transformer when I moved from Canada to CH, in the price range you mention. It has worked perfectly for my high-end stereo. I got a 350W unit.

Just make sure all your plugs are plugged in properly. The unit I bought in Canada had a UK plug, so I needed to get an adapter here. The first time when I plugged it in, I didnt put it in all the way, and there was a mini-explosion. Luckily, I had my system plugged into power bar and all I lost was a fuse. Normally I wouldn't use a power bar on a high-end stereo due to noise, but in this case, glad I did (I didn't trust myself or the transformer).
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Old 05.10.2009, 17:50
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Re: Step-down transformers: Clean enough for HiFi?

I bought a good 1500W step down transformer for my Denon receiver.
I have no hum with that. It is kind of large but I have it hidden away behind the shelf.

I also bought a transformer for my powered subwoofer, but it was not as high quality as the other one, and that one causes my subwoofer to hum when it's on. Its not really noticeable when listening to music, but in quiet parts of movies I can hear it.

I just havent felt like buying a new transformer or subwoofer so I have been living with the hum.
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