Good news, thx
My guess too.
dac : schiit modi multibit
amp : project Ember with a 6N23P produced at voskhod form 1978 with Silver shield.
(more tubes are on the way)
Some people tell me to go for something more powerfull ... like Topping TP60 + HE-Adapter ... other peopls says project ember is ok.
Pick up a brand new Emotiva a100 for $200. Run it full power into your 500s. If you don't like it return it.