Ayon is built to a higher standard then most judt compare
the case a nice machined aluminum , made in Austria Mundorf coupling capacitors
The excellent Lundahl transformers and chokes which is the heart of a tube amp
all tube sockets and connectors Copper not cheap brass like most
and microprocessor controlled which adjusts each power tubes for age , rather then just average all the same to get better life , when a tube does go,a red led comes on then shuts down ,you replace that tubes, hit the recalibrate button and you are back on your way.very solid engineering , tube u.s,a sells them for agood price
or buy one used ,like a spirit2 or 3 .