PrimaLuna Dialogue Premium Preamplifier. DESTROYS SPEAKERS!!

I think any audio product made in China needs a very strict oversight control. Some companies go that extra mile, many more do not. There was an article written in TAS, I think, many years back about all the Chinese factories and how much counterfeit product was being used, schemes drummed up with name brand products using parts of poor inadequate quality that were switched with authentic parts at the factory. The real parts were sold off on the black market. There are probably as many schemes as one could think of, if there is not enough time, money or correct people put into quality control. I feel bad for you as I myself have Line Magnetic Audio gear, designed and made in China. I had one bad transformer that my dealer had replaced, but I paid for shipping the amp. Is there any chance at all that your speakers were placing too much load on the amp? I had thought that may have been the problem in my case...

This is an interesting issue. The reason I had empathy for the OP was because I had three pieces of audio equipment from a popular brand which were all defective with cheap transformers many years ago. The manufacturer would not believe the products were bad, even though he fixed them???The fan base did not believe it either, and they had not seen or touched the equipment! Were they indeed bad, or did aliens make the intermittent spurious noise, hum and sounds coming from the transformers?
Yes they were bad and yes the manufacturer had not found or fixed the problem correctly.
Are these kind of problems coming from a product made in China impossible to happen? I think there are some companies who make shortcuts by getting cheap stockpiles of parts, or even more likely, parts are switched at factories without proper QC. I hope, unlike many here who have outright called the OP a liar????, he gets the situation resolved. In my case, I did not, and lost a great deal of money. Don’t always believe the hype from any brand. I hope some audiophiles out there don’t buy from the company I bought from, (they are made in the USA from parts of unknown origin). Perhaps we all are too smart to make that mistake???

I agree with Ilocquin. Why is it so diffifult to believe with all the hundreds of thousand components manufactured yearly that some are of poor quality or design? I guess the logic is? if it was not "me" that bought some defective gear it must not exist? Also why is it hard to understand that with so many products made in hundreds of factories in China that QC can fail? If a company has moved manufacturing to China, is it not to cut costs to improve profit? Is it not possible to believe that a supply of cheaper parts are chosen over another more expensive load? What about the influx of counterfeit parts in China? Why do so many people believe manufacturing CEOs are always honest and always want to do the right thing? Cmon use your brain, not every single audio component made is made correctly and not every audio brand exec is honest and does the right thing. BTW I don’t think Primaluna sales will suffer from this post! I am sure all the fans of PL don’t have to worry that the company will fold.
I think that most audio forums actually serve an important function to INCREASE sales of many brands. But I think since this is a forum to exchange ideas, experiences, and the glory of musical enjoyment...we also can (and should) talk about the bad or ugly that has happened. If we don’t do that, it really is not an open forum. The forum appears to be more like brand advertisement, not a healthy exchange of ideas and experiences.

Maybe PL has softened their oversight of the Chinese factory where the amps are made. There have been investigations of factory workers swapping parts in the audio industry. There is a black market for parts. Needless to say, PL should give good customer service and do right to their customers.