Audio Research Corporation ARC Reference 600

So I guess nobody has anything good to say about the ref 600's. even at a price under $8000.00 with stands, shipped.
They will need new tubes though. Can I just put tubes in myself, or do I have to have a professional do it?

You could do them yourself if you had a schematic diagram showing you which tubes go where. But the cost would still be between $3,500 - $4,500 for new tubes for both monoblocks. Then biasing the tubes, etc......

I agree with other posters, a brand new Ref75 or Ref150 or used Ref250's would be sonically superior and more reliable (and cheaper in the long run!)

Very nice amps. even compared to today's newer amps. You will love them. However, I believe you may have misread some of the responses. They are simply warning you of the expense of replacing the tubes. That is all. If that isn't an issue or if the tubes have recently been replaced, go for it. These were the top of the line AR amps and they are still incredible. I believe that the 610s replaced them. I also second the recommendation of auditioning the REF 75 or 150 or 250 amps. I love the 250 amp.

Does anyone have any opinion about manley amps? The neo-classic 250's or 500's? Do they measure up to ARC, or VTL?

I just looked up the specs on the Klipsch KLF 30 speakers. Sensitivity is a very high 102 db. Unless you have a huge room and listen at ear-splitting levels, I think you would be hard pressed to stress a good 75 wpc amplifier such as the REf 75. Most of the time you will be listening at less than 1 watt.