Manufacturers with Excellent customer service

Bought a brand new emotiva exp 3 DR and it was DOA. Called them and they had a replacement on the way before they even received the other one back. Took 3 days. Bought some kimber Kable bi-amp 12 tc speaker wires. I made them into full range, kimber sent me the correct heat shrinks and solder for free. Schiit audio on the other hand is a joke. Bought a schiit freya plus and within 3 days the attenuator was acting up, emailed several times stating the issue. A week later the whole unit was dead. Shipped it back and instead of them shipping a new one out they repaired it and shipped it back. Took a month. 

Bryston is another one.

Roger West at Sound Labs
Ralph Kartsen at Atma-Sphere
Jason at Elusive Disc
Radomir Bozevic at TACT Audio. He tried as hard as he could against overwhelming odds.
Me in my own mind:)

Mike Sanders Quicksilver Audio!

Yeah, Mike Sanders.   Once upon a time, I lived maybe ten minutes away from the guy.  I had Numbers 031 and 032 Mono Amps (or was it Nos. 032 and 033?). It was the time when he was using 8417 output tubes which were, how shall I say it, lovely sounding but a bit cranky.  He was ever patient with me as I'd show up to get replacement pairs.  As for the sound of the amps themselves, sheer bliss.