Hattor Audio preamps?


Got my eye on one of these. And yes, my system is passive friendly. I've had resistor based passives before, as well as transformer, autoformer and LDR preamps. So I know I like the sound quality which can be had with a passive. Anyone out there have any experience with the Hattor stuff?

 

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Short answer is that yes, I actually own a Khozmo and two Hattor preamps, and the Hattor Active Tube Stage, and I really like them.

The longer answer is that I became acquainted with Hattor as way to remotely control the volume in my system.  I own a very nice sounding active, unity gain SMc Audio TLC-1 preamp, which has been upgraded to a similar sound quality as their VRE preamp.  Unfortunately, the onboard Shallco VC does not allow remote control of the volume.  I worked with Steve McCormack to modify the TLC-1 so it is now a unity gain buffer achieved by removing the VC from the circuit and replacing it with two large AN silver tantalum resistors. 

With the TLC-1 as a buffer, I still needed a method of controlling my system volume and gave Khozmo a try with one of their inexpensive passive units.  I really liked the sound and the interface/remote so when I saw a Hattor Big Preamp for sale used at an attractive price, I purchased that.  Some months later, I wanted to try their tube active stage and Arek (the owner/designer) gave me a good price on a package with a Big Preamp, which is how I came to own two of them.

In my main system, I use the Hattor Big Preamp in passive mode, which provides me with a system interface that is as good as I have had with any of the preamps I have previously owned.  With the Hattor Big Preamp, you get rca and XLR inputs/outputs, a large display in your choice of color, input selection, and selection of mute, volume, and balance, all controllable using the remote.  My unit has the optional NewClassD OPamp active stage, which provides your choice of 3/6/9 dB gain, also selectable by the remote control.

Sonically, the Hattor Big Preamp is great, IMO.  I have literally owned about 20 preamps with at least two costing north of $10K before I found the SMc unit I have now, and IMO the Hattor would hang with all of them, particularly in passive mode where it seems to have close to zero impact on the sound.  You do get your choice of resistors and I chose the Amtrans AMRG carbon film resistors, which are made in Japan by the former distributor for Riken resistors.  In my Khozmo unit, I had Takman REY shunt resistors with the Vishay Zfoils in the series position, and IMO the AMRG Trans resistors in the Hattor sound more musical.

Regarding gain, I could be happy with the sound of the discrete OPamp board in the Big Preamp.  I could also be happy with the Khozmo Active Tube Stage, which sounds very good (a bit more musical/natural than the OPamp board) and better than the Tortuga and Purity Audio tube buffers I have had (on loan) here in my system.  My unity gain SMc TLC-1 buffer sounds better than all of them to me, so that is what I use - with the Hattor in passive mode providing my system interface. 

I hope this helps.   I would be happy to answer any specific questions.

I have been using Big Hattor Dual mono (AMRGtrans, active phase of NewClassD for two years now - but I usually listen in passive mode) in conjunction with the SimAudio Moon W8 power amplifier. It suits me perfectly. Compliance with the input impedance of the amplifier is an important consideration for operation in passive mode.

I have one that’s got all the upgrades and the tube stage as well. It’s a superb preamp for sure.  In my system, the tube stage adds a lot to the sound being amazing.  I recently compared to the Benchmark and there was no comparison, the Hattor is worlds better.  This piece oozes quality and sounds incredible.