Actually the Ayon Scorpio xs is their latest and operates in pure a Class A which power wise is more perceived control and is noticably cleaner ,and has Triode as well as pentode mode
which makes it very versatile with el34 tubes40 wpc in pentode
and 25wpc in Triode ,add 5 watts if using kt88 .
also this is a big one it is micro processor controlled on the power tubes it allways monitors the tubes for optimum sonic level
also if a tube goes bad the danger of overheating is removed if it detects a fault it will go Inyo mute and disconnect ,it will tell you
which power tube it is , then turn back on with new tube hold in rebias button for 20 seconds then it will blink untill ready then the red Ayon light stays on and ready to go ,also solid machined chassis ,not sheet metal like most = less vibration better focus
as well as pure copper tube sockets ,most are lower quality grass zinc coated ,also the most important part World class Lundahl transformers ,and chokes from Sweden ,a true bargain nothing even at $4k has all this ,and you can get it for just over $3k.