I have one from the 2000 timeframe. I think that almost all were made around the year 2000 as a custom run for Norh at the factory that made various California Audio Labs CD players (among other brands?).
"According to nOrh, the CD-1 was designed to provide the highest quality output possible from a CD-player. The CD-1 is an original design CD-player, not a retread of an existing unit. nOrh has designed the player around a 24 Bit/96 kHz, Burr Brown PCM 1728 digital to analog processor with a vacuum tube analog output.
It combines these components with a high quality, Matsushita transport, seven power supplies, and a Crystal CD8414 Low Jitter Receiver. In addition, the CD-1 uses two transformers, one of which is dedicated only to the analog circuit. The CD-1 utilizes 8x oversampling at a 96kHz sampling rate. The analog circuit uses a pair of 12AX7 twin-triode vacuum tubes. For complete specifications, please refer to the CD-1 webpage on the nOrh website."
http://www.tnt-audio.com/sorgenti/norhcd1_e.htmlI have changed one set of tubes since I got it.
I now have another one and some other nOrh and IRD gear I have acquired.