Jolida JD100 and JD100A,whats the difference?

Muralman1,

We are on the same side here. I enjoy listening to my cd player(JD100A) as well as you enjoy listening to yours (JD100). I just want to clarify that no circuit topology, design, function, balance, etc. were changed/reconfigured/compromised from transforming the stock version to the modified unit. The changes made through using better parts (caps, resistors,signal path wiring, signal jacks, etc)on circuits only to ensure that the full potential of the design and function of those circuits can be maximize. Please, if someone you know (and is quite near to you geographically) has the JD100A, take a listen and compare it to your player. They are different. Both of them are very good in their own way.

I do not believe that the stock version has the same bass response (assuming identical tubes between the two are use)than the modified version. I heard both, and I can bet that they are not the same.

Also, the modification is company/factory approved (warranty stays intact)probably because of two reasons. First, it makes their product outperform other players at higher price points, thus greater visibility on the market place from budget conscious audio enthusiast like us. Second, no changes in the topology, specifications, operation, lay-out, circuit function, etc. were made to jeopardize the integrity of the design. Just improvements on the type/quality of parts used.

Lastly, I am not affiliated by any means to Jolida, Parts Connexion (doing the mod), or any dealers/retailers of Jolida/Parts Connexion products. I am just a consumer who's very satisfied with the player that I bought.

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.