Hattor Audio preamps?

Well heck.

Now I'm really wondering how their integrated sounds!

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.

Can someone give me the rundown again as to the rule of impedance compatibility?

Thanks!

the higher the input impedance of the power amplifier, the better, the minimum from which I would probably be interested in passives is 50k