A DAC for my H/K HD 7600ll

I'm wondering how much I'd have to spend to upgrade my H/K HD 7600 MK 11 with a DAC. When this player was made in '88-92, it was considered as good as any player on the market, and I couldn't afford it then. I bought this one like new in the box on Audiogon recently, and it ran circles around my Simaudio Moon Equinox, which I then sold. I also ran into somebody--don't know who he was--who was lamenting his loss of such player because parts were no longer available. I guess his message was that he had found another player that he liked as well which had tubes in the analogue section. I think the page was dated 2005. I give you this history because the player is so old that I'm not sure anyone knows it anymore. Lynne