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drdna wrote:

Well, I think the short answer is yes. What the people over at Technical Support have told me is that this is due to the power supply design of the amplifiers that are being driven by the PP2000 and that it seems to be characteristic of certain types of circuit configurations such as a low powered SET amplifier driving a high efficiency horn loudspeaker. They say this is not the typical stereo set-up and they did not test this when they originally designed the PP2000.

I think that this explanation they gate to you is completely bogus. My PP2000 drives 19 loads with all imaginary PS circuit configurations. I also have high efficiency loudspeakers and I have absolutely no noise of any kind. So, I think that it is not the design problem in PP2000 but some kind of bug that they have in circuit that they overlooked since they produced the production run the happened to be I bought. I am not kidding – I have absolutely no unreasonable mechanical noise from nether the unit nor from loudspeaker. If DC is nulled out then it is absolutely problem free. I know that I sound as I am gloating but it is what it is….

drdna wrote:

Now, they say they have got this kind of circuit set up in their stereo testing lab and have replicated the buzzing results. Each time I call them they say that they are working on finding a solution to this problem and "getting close" -- but it has been almost a year now with no end in sight.

Adrian, it is how they work you need to accept it. I have once in a month conversation with them about my “fuzziness” and they reported that they found the problem and found the cure. It was 6 month ago when they told me about it for a first time, presumably the will send some kind of fix to test in a week, or month, or who knows… Sometimes I call them and they do not even remember what we were taking the last time - it is almost insulting. It is the way how they operate. Still, somehow they slowly do better things and I am sure that soon or later they will send me the fix for my “fuzziness” problem. You just need to keep bother them, relentlessly bother them….

drdna wrote:

Probably too late for me to return it at this point.

With all my negativism about their slow moving progress I have to admit that I never heard from them a comment that my unit is out of warranty or something like this, but I never intended to return it ether. I think that if it is what you worry then you need to make sure the you initial claim about your defect would be with a return period and you then shall be save. If I like the sound of the unit but it has some noise that they feel they will fix then you need to negotiate the return and warranty policy. Again, it never was a problem with me and they acted very polite in this manner.

I have to admit that I do not believe in the “buzzing” problem as you all described. The buzzing you have reasons but no one told those reasons. What buzz, why it buzz.. no one told it concussively yet. What the fundamental and this buzz? At which condition it buzzes? What the measurements are? The expansions of the level of “characteristic of certain types of circuit configurations” I would reject as bogus and not sane. What certain types? Why? Will it buzz if you decouple the regenerator with isolation transformer? How are you planning to debug it is it has no date to interpret what is going on?

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