Streamer+R2R dac+True balanced Class A preamp all-in-one?

I’m not familiar with one- combing those capabilities in one bad and doing it well would be a tall order indeed. The closest device I know of (since you stated R2R) would be from Bricasti Design- not sure of the gain/pre design. Retail on this starts at $16K new.

Bricasti M21

+1 on Bricasti. The onboard volume control is superb. 

May not be R2R, but I don’t think that should stop you, but the Auralic Vega G2.1 (and now G2.2) pretty much fits the bill. Analog volume control, class A preamps, Streams most things.

the right way is called separates

my setup : Lumin U2 - R2R DAC Rockna Wavedream XLR - dual mono passive preamp Big Hattor - amp Simaudio Moon W8

No Tubes?