I live in the Minneapolis, MN area and am a friend of Dean Klinefelter's. PSE has always been a labor of love for Dean rather than a profitable, "full-time" business. Even when he was manufacturing product, it was low key and in smaller quantities at best. And, like most small businesses, he always had to operate on a "shoe string budget". Though his designs were outstanding, he never got the notoriety that he deserved. If you think I am wrong, just ask Richard Vandersteen of Vandersteen Audio. Dean happens to be a friend of his...and one of his very favorite designers.
Another friend and myself are trying to convince Dean to reintroduce some of his designs [in quantity] back into the "audio business" because they are some of the very best available. And, yes, because of his dispostion, he is not the very best business man. He will many times fix an amplifier or preamplifier that is out of warranty gratis (much to the chagrin of his wife, Genny). He absolutely has a heart of gold (but not necessarily a head for business)!
He still operates PSE on a limited basis out of his home and supports his products diligently. I am surprised that he has not responded to your phone messages, but, like most brilliant people, he is easily distracted by new and hot projects. If he told you that he is waiting for parts...he is. He and his lovely wife are currently building their dream home in a dream setting on a lake in rural Minnesota. This project actually takes up much of Dean's time, since they decided to build the home themselves.
If you do not hear back from Dean soon, let me know and I will contact him personally. I really regret to see his business and integrity questioned when I know the heart of the man personally.