Looking at their website, Linn appears to have a product line that aims to provide a complete system at different price points with flexibility to offer one-box (wifi streamer, DAC, player and integrated amp) simplicity to more traditional analog source and separate components. They offer active and passive speakers, the actives with multiple separate DACs and network connections. The Linn product line invites comparison to Bang and Olufsen for their similar philosophy of offering complete integrated systems that emphasize both sound quality and style.
They don't do tubes or class-A. They apparently design and build their own DACs and their amplifiers are digital, similar to B&O and Devialet.
In the USA, there aren't many dealers, so finding a location to hear a system of their equipment might be difficult. They are a UK (Scotland) company and it seems most of their market is in the UK and Europe.