hospital grade or commercial grade receptacles ?

Tbg...In keeping with your suggestion to make observations, I went outside and looked around. I observe that the earth is flat.

Eldartford, does that mean you agree with Irvrobinson?

Albertporter...Come now: you know that two audiophiles will never agree completely. My comment of 11/14 sums up my opinion.

So, you mean to say you think your statement is correct?

If they were real changes in the electrical signals going to the speakers, they could be measured, and they would have a technically identified cause.

And if your answer is yes, how do you explain the fact that a half dozen NOS tubes that measure identical (electrically), sound completely different?

It appears you are saying, if it can't be measured it cannot be audible. I think you know better than that.

As for Irvrobinson, he may be like some that have already passed this way and are now gone, those that came to Audiogon to argue without any concept of the importance of every part in a high end system.

Now there's scientific observation and conclusion at its finest:

I have new outlets.
I tried different power cords and didn't hear a difference.
Therefore, different outlets can't make a difference.