Air Tight ATM-300R or Shindo Cortese 300B

Charles,

Perfect your summary: Air Tight as a more audiophile trace and Shindo as the essence of musicality.

Thanks.

If you are looking for something ultra musical and very traditional sounding for a 300B, check out the Art Audio Diavolo.  It is supremely well designed and is a popular choice in Europe.  Aesthetically, I think it is very good looking and build quality is first rate.  My biggest issue as the US importer is that these amps never die.  I regularly talk to people who are in year 15 or 20 of ownership and looking at a refurbish, rather than replace.  

Your preamp is well suited to the Diavolo with 1v of output and you will get the lush, musical mid-range that people crave from a 300B.  

Air Tight and Shindo are undeniably brilliant.  I think your comments above are spot on regarding these two brands.  Shindo would be the better choice based on your description but I also agree that Shindo is best with all Shindo.  

Good luck.  

Thanks for your return.

I think the Art Audio could a gret choice too, but here in Brazil we don't have an Art Audio dealer.

Thanks again.

There are so many possibilities. I have an AncientAudio SET. Other good options: BorderPatrol (SET, PSET, and PP), AudioNote, Yamamoto A-09s. And if you follow the various 300b conversations, the choice of the tube is as important as the choice of the amplifier.

I am certain Tom will ship directly to you from the UK or I could arrange for delivery to you as I am always happy to help the brand globally.  
If you were merely being polite, cheers and good luck.  Understand completely.