Any US manufacturer of a 845 SET amplifier

Are you looking for an amp or integrated amp?

Cary Audio makes an 845 based amp --  

https://www.caryaudio.com/products/cad-805rs/

And Line Magnetic makes both 845 integrateds (845ia and 845Premium), and amps (503PA and 513PA).

I'm a dealer for both lines.

And we generally do not see issues with Line Magnetic.  But if you do, there's a service facility for everything that Tone Imports brings in here in the US for repair.

Thanks all. I should mention that my budget does not exceed $5000.

@goldprintaudio  thanks for chiming in. I had you on my list as a dealer to call regarding my questions concerning LM amplifiers. I will do so.  

At the moment I am in a quandary as to going to an integrated vs. looking for a tube amplifier to rotate with a SS amplifier using my Aric Audio tube preamp. 

From my observations the Tone Import web site doesn't supply much info regarding LM. I had planned on calling them to find out more regarding the service facility they use.   

Feel free to send me a PM on here or email and we can chat about who does the service work/etc. 

@goldprintaudio  Done. Thanks!

The 845 Turbo made by Coincident Technology was discontinued several years ago.