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Thread Starter 
Has anyone tried this DAC? It seems to be the only commercially available portable (i.e.small, self-contained and battery-powered) NOS DAC out there:

http://www.ebay.co.uk/itm/Non-Oversampling-DAC-TDA1543-DIR9001-96kHz-SPDIF-Coax-Optical-9V-NiMH-charger-/200858459050?

I am considering using it between a DX50 and a Tube Amp BL-2.