I've had little trouble with six ARC pieces owned over more than 40 years.
In that time all my pre- and phono amps had been ARC until I wanted to upgrade my phono- last year and found almost no ARCs now run true balanced. I bought the van den Hul Grail SB and love it.
I also run a Ref 6. No plan to upgrade.
I still also use an SP10, way ahead of its time and perhaps their most iconic pre-amp.
In that time all my pre- and phono amps had been ARC until I wanted to upgrade my phono- last year and found almost no ARCs now run true balanced. I bought the van den Hul Grail SB and love it.
I also run a Ref 6. No plan to upgrade.
I still also use an SP10, way ahead of its time and perhaps their most iconic pre-amp.