Hattor Audio preamps?

I don't, but coincidentally I was just in contact with a fellow who owned one and he was quite impressed with his. Nice wood case, too.

They certainly do look the part. If I buy, I will be ordering with the AMRG Trans resistors. It appears that you get a lot for your $$.

His had the Vishay, so the one your eyeing should sound even better.

And they really do appear quite reasonable for what you get.

Cool logo, too!

I was quite happy with my dual mono, balanced unit. Unfortunately, it presented an Impedance mismatch. He sells a buffer that would have resolved it, but I didn't want to risk installing myself. Extremely well made

I have a couple DIY preamps using fully balanced Khozmo stepped attenuators which I really like. Hattor is the brand used for complete preamps from the same company. I prefer an active output stage, which Hattor also offers. 

I have not tried the AMRG resistors, but have read good things about them.  My first build uses the Takman REX resistors in the shunt positions with a Vishay Z-foil series resistor. This combination sounds excellent with exceptional transparency. My other Khozmo use Takman REY shunt resistors and an Audio Note silver tantalum series resistor. I'm still working on tweaking this preamp which uses different power supplies and output buffers, so I'm not ready to say whether I like this combination better or not.