Musical Fidelity's x10-v3 tube output buffer?

I too tried the original 10XD and found that it only "smoothed" (i.e., veiled) the sound in my system. Maybe the new version is better. Dave

My experience of the new X-10v3 is very positive.
I think it is important to note at the outset that the results when used with the X-PSU (power supply) are several levels of excellence higher.
Without the X-PSU, the X-10 came across as sweet and smooth, wonderful for strident or slightly harsh CDs, but perhaps mellowing CDs that needed no such assistance. Female voice and flute seemed to benefit nicely. Transients however lost some bite. Soundstage doesn't seem to be affcted one way or the other.
However, with the X-PSU in place, the X-10 is in a different league altogether. Any "veiling" has vanished and the sound is as detailed as one could wish, but with a sweetness that is beguiling and as good as anything I have heard on CD. Absolutely lovely. and the soundstage really does snap into sharper focus and extends deeper.
As a combination, I would recommend the X-10 and X-PSU very strongly indeed. On it's own, I'm not so enthusiastic.
I have just purchased the X-DAC too. But after just a couple of days, I can't give a definitive opinion yet. Both the unit and the new digital cable need some break-in time. Let me say though, that the X-Ray player I'm using with the above units is a splendid performer in its own right, so any improvement should make it spectacular.

It's been only a few days so far. I am not sure it is all burned-in for fair audiotion. Anyhow, X10-v3 tube buffer does 'volumizing' the presentation or smooth out the texture and the details. Music is a bit slower than before. It helps certain types of recordings but they are small percentage among my CD collection. It's not my taste, at least with my current system set-up. I'll return it, if x10-v3 does not improve over the next 2 weeks. I'll post in 3 weeks.

If you hear music to relax, if might help. But, there are good CD players, cost at or lower than $400, that can do similar stuff very well (used Rega, NAD, etc.)

Note: I have not used X-PSU. My CD player is one of the top of the line Sony.

It does not work with most of the cd player amp/preamp combinations as in my opinion it smears the high frequency and robs the shimmer from the recordings, I owned it when I bought the Marantz CD-63SE with which it was a good match for some reason. After changing the CD players I kept connecting it and somehow the sound was always better without the DUFFER in between.

$400 + an ADDITIONAL interconnect is a lot of money even if it does give you a feeling it is doing something.Besides, many thought that changing the stock tube inside makes it sound even better so add that too if you have to go for it.Some serious audiophiles who are technically inclined had said that it is nothing but a noise generator and should be promptly removed from the system to whoever was using it at that time. I would simply spend on more music than on this product.

The good thing about it was that I was able to sell it at almost 80% of the originl price 2-3 years later. Never regretted the decision.

This is my sincere advice based on my personal experience with the product.

Conclusion: Sheer waste of money!

Just my 0.02 cents worth

I agree with Quadophile.
It was nothing but a noise generator.
X10-V3 tube even failed to improve $100 Sony CD Player as you and I guessed.

I returned mine.