Best Vintage tube amp / preamp manufacturer


From the 60’s and 70’s. Macintosh obviously comes to mind. And which models of the brands. There aren’t that many but I am interested to know your thoughts. 
I have a bit of a Mac and Fisher collection going on. 

pkvintage

I recently heard that Acrosound amp.  It sounded very good.  My concern with it was with how hot it ran.  The owner has had it a long time, so it appears to be durable, but I found that amount of heat a bit troubling.

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