really? .89c ground lifters?

Why any manufacture of audio equipment today would still be designing and building their audio equipment using the old out dated AC safety equipment type of grounding beats me.

Double insulated type AC power wiring in their equipment would not cost that much more to produce.

I must assume from some that have posted here no one that lives in an older home that has only 2 wire receptacle outlets, (no equipment grounding conductor), has audio equipment that has three wire plugs.

UL should require all manufactures to build their audio equipment with double insulated power wiring or the manufacture would not get the UL label.

I must assume from some that have posted here no one that lives in an older home that has only 2 wire receptacle outlets, (no equipment grounding conductor), has audio equipment that has three wire plugs.

My home was two prong plug when I moved in and never had a noise problem. Over the years as my AC was upgraded and the three prong plugs of audio gear were actually connected to ground, I began to have problems.

When I say problems, realize that having done photography for various audio manufacturers and reviewed equipment for PFO as well as my audio groups testing, I've had a heck of a lot of equipment connected here.

Ralph is right that grounds are done many different ways on various pieces of audio gear and sometimes all you need do is change preamp or amps and the problem pops up.

No one has mentioned electrical phase. Many stereo systems are connected to both phases (or sides of the supply transformer outside) with ground shared. Good way to get hum and very difficult to get rid of.

Again, equipment dependant. I'm sure some of you are connected this way and have zero problems.

I again want to reiterrate that removing grounds is not only unsafe, it is irresponsible and the potential is not for electric shock, but for death. People are minimizing what could happen here. As an Electrical/Electronics Engineer, I am telling you that lifting the ground and you become a better ground than the house ground and electricity will take the easiest path to ground and that becomes you. There are many ways posted to find the faulty equipment. Please do so and fix the problem, do not lift grounds. Remember, "Accidents" happen when you do not expect them to. Lifting a ground in my opinion and getting severely shocked or causing a death is not an "Accident" you were asking for it by lifing the ground. Also, the load in your home should be balanced on each phase. Having all of your high power equipment on one phase will overload the wiring, cause it to heat up (IxIxR) losses and cause the insulation to fail causing a major electrical fire. Imagine having one outlet or several outlets in series back to the panel on one phase. You now have a 10, 12 or 16 gauge wire w/neutral caring all that current. Is that wire rated for the maximum amount of your equipment? If not, no electrician worth their salt would allow this. Having your equipmen balanced on each phase is the proper way and having several independent outlets run to each phase with their own neutrals is the proper way. Example would be if you have mono amps for your speakers. One proper way is to have separate outlets for each amp run back to the panel and another outlet run to the panel for the lower powered equipment (pre-amp, turn table, tuner, cd player, etc., which should be combined via a conditioner, or multiple outlet device.

Enjoy and stay safe

The following paper, by Bill Whitlock of Jensen Transformers, presents a good explanation of why equipment connected via unbalanced interfaces (i.e., rca cables) is inherently prone to the kinds of problems that have been mentioned, and presents some approaches to dealing with these problems that do not involve lifting safety grounds:

http://www.jensen-transformers.com/an/an004.pdf

Regards,
-- Al

As an Electrical/Electronics Engineer, I am telling you that lifting the ground and you become a better ground than the house ground and electricity will take the easiest path to ground and that becomes you.

Say what? Please explain how the human body can be a ground for an AC grounded power system......

Also, the load in your home should be balanced on each phase. Having all of your high power equipment on one phase will overload the wiring, cause it to heat up (IxIxR) losses and cause the insulation to fail causing a major electrical fire.

We are talking about audio equipment here.... In most cases all the combined connected loads would only add up to around 8 to 10 continuous FLA at best... Most hair dyers pull more than that.