using a transformer to separate your gear power

Truthrider: They are expensive. The one I used was an engineering unit for a medical device that was no longer needed, so I got it for free. Finding 6.5 kAV units are not easy and they are expensive--as are the Equitech units. I did also contact (by e-mail) Equitech and let them know that it has been reported here that their devices may be a serious safety hazard and are likley to be banned in the US. I am hoping they will respond, as I have spoken to the engineers there before and they have boasted about their UL listing. It makes these claims of safety hazard and likely banned in the US hard to believe, but we will see what they have to say about it.

We have used a isolation transformer for years. We use a standard line no current limiting conditioner for amps, pre. Isolation transformers for all digital. My HDTV for that matter. The differences with and without isolation transformers is staggering. We actually plug our isolation devices into our line conditioner for even greater improvement. The tonal qualities, soundstage, blacker blacks etc. is all improved using these devices. We do not use the balanced type so I'm not sure as to the safety issues mentioned above.

I find myself commenting here on a rumor that balanced power is on its way out in the US.

This is patent nonsense.

In 1996, Article 530 Part "G" was adopted in the National Electrical Code by the members of Technical Panel #15 which includes representation from literally every segment of the electrical industry including electrical inspectors, chief electrical engineers of large corporations such as Universal Studios, manufacturers, IBEW Union representatives and a host of other electrical authorities.

In the most recent edition of the 2002 National Electrical Code, Article 530 Part "G" was superceded by a new article dedicated soly to the implementation of balanced power. The committee felt that its place deserved an article of its own in the codebook. That would be Article 647. The primary difference between the former text and the current version is that the scope of balanced power has been widened to include ANY sensitive electronic apparatus, not only sound and video equipment.

This doesn't sound to me like anyone is going to ban anything. Rather, it is quickly becoming the electrical industry standard for applying power to sensitive electronics of any type.

I hope this straightens out any confusion.

Thanks for the space.

Martin Glasband
President, Equi=Tech Corporation
Author Article 530 Part "G" 1996, 1999 NEC
Author Article 647 2002 NEC

Rives: 6.5 KVA ??? Now THAT is a transformer. Only problem is that you'd need one HELLUVA circuit feeding it in order to tax its' capabilities : )

Martin: Thanks for responding. While we've got you here, can you clarify something for me ? If a noise source is generating interference into both sides of the AC line in equal amplitude and phase, will "going balanced" filter that out ? I think i already know the answer but would like to get input from someone that specializes in this field. Sean
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Sean: As I said it was for a medical device (an x-ray unit). This is actually a small transformer for an x-ray unit. I did use a 220 v 30 amp line to feed into it and then had 110 v with four separate circuits and filters. 2 were 15 amp and 2 were 20 amp. Obviously, the equipment did not draw all that or it would have caused the 220 v 30 amp circuit breaker to go.