Audio Research Corporation ARC Reference 600

Although I am an ARC warranty repair station and would be happy to service them for you, the fact is with a total of 32 6550 output tubes and 8 regulator 6550's you have multiplied your chances of arcing a tube by a large percentage. Unless you need that kind of power, (you didn't mention the speakers you would be using or their sensitivity), and you have friends to help you shlep them around, I would tend to look for a lighter, lower powered ARC amp. Ref 75's are nice.

I use Klipsch KLF 30 speakers. It's not about needing the power, it's more about the paraphernalia of it all. Like hot rods or muscle cars, sure, you may not "need" 600 horsepower in a 65 Mercury Conet Caliente. Lol
I had a pair of VTL MB 750. Maybe I should look for a pair of those. They only have 12 output tubes. It just seemed like a good buy as I can get 600 for the same price most are asking for 300's. and 300's weigh 132 lbs, so they are not all that much lighter. From the sounds of it, these 600's are too heavy, too many tubes, and almost 20 years old, so they may be a financial disaster. Thank you for the input everyone!

On your speakers a singe Ref75 would be sonic heaven, seriously give one a listen, it is one of the best sounding amps ARC has ever made.

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!)