Which one


Hello, 

I want to know which one you would pick that sounds the best?

marantz 7 (tube), McIntosh C22 and Audio Research SP 10?

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Marantz 7. IMO, any early original Marantz tube gear from the early sixties before the company was sold is the best sounding and the most collectible of all!
+1 Marantz 7! Designed by Sid Smith - who also designed the Model 8 and 9 tube amps.
Here's the answer you already know. 
It's all up to the individual's personal preferences, and you will receive a variety of different answers.
I believe you need to talk to someone that has heard and can clearly describe the sound of the three. Even then in your own listening environment with your equipment and room acoustics, you may get different results. Personally speaking I've not had the oppertunity to listen to them.