High Current SS amps with input impedance = 200K


I'm looking to identify amps like this that would match optimally to an Audio Research sp16 tube pre-amp with output impedance of ~ 20K?
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Showing 3 responses by glai

Al,

Thanks for responding. Th preamp in questions:

Einstein the tube, 100ohms
Allnic L400, 250ohms (supposely flat with transformer coupled design)
ARC Ref 3, 600ohms (1400ohms at 20Hz)

I use interconnects 1 meter in length Nordost and Stealth.

Many thanks for your insight
I think there is more than just a calculated drop of output in the bass frequencies. 0.4db would be difficult to hear especially at 20Hz.

My SS amps have input imped of 67K ohms. I have used a few tube preamp that has specified output imped of 100ohm to 600ohm (may be higher in the bass freq.) Subjectively, there is tighter coupling betw the pre with the lowerest output imped and the amp. I hear better transient attack in the mids and tighter bass. In some ways, it is similar to changing the load imped on cartridges.

I suspect that there is also interaction in the time domain and/or dampening.

I am pretty confuse myself. Any help is appreciated.