I too have the Orchid DAC and have tried several brand tubes in it. Each having it's own sound signature. Vibration isolation, cables and power conditioning would probably have a greater effect than a different amp of similar power output using all the same existing other components.
If I really had $5000 dollars to spend and being primarily a digital listener replacing the Orchid would be the biggest improvement for the dollar.
If I really had $5000 dollars to spend and being primarily a digital listener replacing the Orchid would be the biggest improvement for the dollar.