I have 2 Wadia 321. Been running in my system for years without a hitch.
On occasion I run the one in my main system directly to my amp as a pre amp/dac because i can use XLR. But I always fall back to using my tubed pre but have to use COAX as it does not support XLR. I often wonder what it would sound like with a Tubed Pre that support balanced connections.
Mcintosh group shelved Wadia but you can still get service from a company in CA. but I have never had an issue with either of mine.
I dont know if you got a manual? But if you running it into an integrated or pre the manual indicates to set the volume at 88