Upgrading AudioNote DAC2 older version Help


Hi,
I own an older AudioNote DAC2 and plan to upgrade some of its components. Could anyone provide me with any information of which part should I upgrade and using which type of components (ie. using which BlackGate?)
I currently had its tubes replace with the Amperex 6922 PQ, however, the effect was minimal. I hope by using the BlackGate, its performance would increase near/similar to the newer DAC2.1x.
Thanks so much.

Regards,
Adinata
atjandra888
Hi,
Is there a big improvement when comparing the upsampling-AN DAC with the non-upsampling one? Because, actually I feel that the one I have (w/ upsmapling) is very musical (although the vocal is more laid-back).
Thanks
All I can say is that all the dacs that are non oversampling are by far the most superior sounding and musical dacs- even in a £200 Far Eastern DIY JOB. So in my mind it is the dac rather than any other component that is foremmost in importance. Peter should be able to verify this.
I guess I have no choice other than replace my old DAC-2 with the new one/ other DAC.
Thanks so much