hospital grade or commercial grade receptacles ?

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.

Albertporter, I'm not sure how to respond... I think I have a concept of the importance of every part of a high-end system. I just have a different perspective than you do.

I have to admit, though, I have been out of touch with a certain segment of the high-end community. This segment includes people that think power cords have to be broken-in, and even believe that the wall outlet makes a difference. I won't put too fine a point on it. I think people with these beliefs are misguided, and I think they give audiophiles a bad name. And, no, I don't think it's my mission to police the audiophile world, I'm just having fun in a discussion about the undiscussable.

Albertporter...Measuring tube characteristics is not the same thing as measuring the audio signal applied to a speaker. Note that I talked only about the electrical signal applied to the speaker. Parameters that are defined and measured for tubes (and other components also) are intended to identify faulty items, or to monitor production quality, not to cover every characteristic that might affect sonic quality in some relatively small way. The speaker can only respond to the applied electrical signal. If the sound changes it must be the result of a change in the electrical signal. Do you agree that if the electrical signal is identical, the sound is identical?