Jolida JD100 and JD100A,whats the difference?


Somebody knows what is the difference(if there is any) between this two versions of Jolida CD player(what actualy means this "A").Especialy if somebody knows about any possible differences in sound.I bought today one Jolida JD100 from Hong Kong (ser.No. 300211091), and id like to know if there is some better sounding version than mine, or mine unit is up to the newest standards of Jolida?I am from Portugal ,Europe.
I allready asked the same question (via email) the Jolida ,i am waiting for the answer ,but in the meantime i would like to know your respectable opinions, folks . Thanks
ziva
I didn't know that there was a JD100 and JD100A. I recently purchased my Jolida and it is marked JD100A and it is a bone stock unit from Jolida, not the version that is being modified buy Parts Connexion. I haven't heard a modified one yet but the stock one is no slouch and does the things that are claimed for the modified one. The stock unit holds it own against some very expensive digital that I have either demo'd in my own system or heard in others.
Jolidas US dealer(he made Parts Connection Mode) informed me that there is absolutely no difference between two.Both of them are in fact one-JD100A ,but on some units "A" is not printed,little confuse ,he said ,but, so it is.
I saw today ,my unit have Sovtek 12AX7LPS-like stock tubes.Muralman ,whitch tubes are the best for JD100 in your opinion,regardless of price?
Without a doubt, 5751 tubes old stock. They are hard to find, but are relatively inexpensive. I've had much more expensive Telefunken and Mullards on board and the 5751 tubes bested them with greater extension, and detail. The midrange of these tubes are very clear and the background is black, with none of the 12AX tube microphonics.