I have for sale a couple of vintage DACs which may suit your needs. an AMC DAC8 - 18 bit mid 90's DAC, 4 digital inputs (3 coax, 1 optical), all switchable. locks onto 32, 44.1 and 48MHz. Have used it over the years with a Rotel 965BX discrete (yes, it improved the sound of even that super CD player), with an Xbox-one and a TV on optical out, and most latterly as a DAC for an apple airport express (suprisingly good streaming set-up on a budget!). £90 inc postage. One missing button cover on front.
Also for sale a Arcam Black Box 2 (includes optical input). Philips TDA1541A dual-DAC according to Stereophile. Old - but I do like the sound (been my main CD player for well over 15 years). matching Delta170 transport for sale too if you wanted that. £150 inc postage for the DAC.
dm for pics