Jolida JD100 on the way

I went by Joe's NOS tube suggestions and currently have Sylvania 5751 in mine although my pair of GE 5751 sound very good too but slightly different flavor. Great cdp, I don't think you need to do much more but to find the right pair of tubes for you. Arthur

I loved Telefunken 12ax7s in mine. Though EH5751 Gold Pins were real good as well. Its a system synergy and personal preference thing.

I used sorbotane feet first. Ehhh. No feet. Not Bad. Cleaner sounding highs. Vibrapods. Ehh. Lastly I used a triple cone setup, which worked best. This player responds to power cord changes too FWIW.

This is a real gem of a CDP. But alas I wanted a CDP with a good volume control to run direct to my amp, so it has been sold.

I would say stick with the standard feet. Try the Mullard CV4004 on the entry level price range of NOS, to the GE 5751's or others you can find in the archived threads. Do a search on JD-100 and I am certain you will pull up some good tube suggestions. Enjoy that player!

I, too, went with Joe's TUBE LORE suggestions and have used the following with good success:
Sylvania 5751 3-mica
RCA 5751 3-mica blackplates (late 50's vintage)
GE 5751 3-mica blackplates

Am currently using the Raytheon 5751 w/windmill getter and really like it.
If you want to stick with the 12AX7 type, try the RCA 12AX7 long blackplates.

Of course, there's the "system synergy" issue which may be complicated if you have any other tube equipment in the signal path. Finding the right combination may take some time but will be well wotrh the effort.

Good luck.