You may want to list what your gear that you want to use it with to get an accurate opinion on its benefit or negative influence for your needs. My friend in our audio club has used one for years and he likes it.
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You should note that the MF buffer has only unbalanced inputs/output and may be an issue if you are using balanced connections with the BAT preamp. I use the buffer between my Arcam CD23 and Placette active line stage (using VD Nite interconnects) and it sweetens the midrange a bit. Also makes the sound a bit easier to listen to...less digital. Music Direct has a good return policy and I believe that unit is on sale right now.
I added this tube buffer to my system when I found it a bit fatiguing, and hoped this would smooth out my CD/SACD player.
It is nicely made and nicely packaged, easy and fun to use.
This perhaps contributed to more of a placebo effect improvement, as other threads have suggested the benefits are not extraordinary and depend mainly on the source.
Now, I am experimenting with it as a buffer between my PC using Apple Lossless files, a cheap USB to RCA interface and active monitors on my desktop.
Would anyone know what source devices would be most likely to benefit from this device?
First of all Mobile Fidelity does not make a tube buffer, but Musical Fidelity does. The purpose of the buffer is to present the driving component with a very high input impedance and the driven component with a low input impedance. The appropriate application for the product is when the driving component uses an inexpensive op amp output stage, think DVD players and cheap CD players here, or with very long cable runs that are adversely loading the driving component. Some also report a nice softness that the tube imparts in its distortion signature. I have one, but never use it with better components.