Cheap Amazon Chinese tube pre amps

Yes, I bought a cheap tube buffer. Swapped the tubes out for better ones, replaced the power supply with an ultra low-noise power supply, and replaced the volume pot with a resistor-based voltage divider. I ended up with two of these for dual mono preamps. How does it sound? Ridiculously good actually. I attribute that to the simplicity of the circuit, the power supply and the tubes. If you end up trying something like this, I recommend buying something simple, like a tube buffer not something fancy with tone controls, etc. Simple is good. Complex can work, but the designer better know what they are doing and I’m not sure you’re getting a good designer when dealing with cheapo components like this.

waste of money,. Good tube preamps start at $700  like the jadis clone I bought off ebay yrs ago,, sold it...then my pick is Cayin's preamp at $1400

@mozartfan is correct. even with chinese cheap labor, you still get what you get for a hundred bucks. I tried a few of the more expensive models (300-600 range). They are much better, but still not a 16K preamp.

I bought one a while back. Xiang Shen or something like that. I replaced the tubes in it with some Electro Harmonix, then some Gold Lions.

It's not a good pre-amp.

Does it work? Yeah, it works......
Would I recommend one? No, I don't think I would.

It's just a "meh" piece of equipment, made with very cheap parts. 

'It's just a "meh" piece of equipment, made with very cheap parts'. thanks. I think i got my answer. a tube buffer maybe but a no on the pre amp.