Amp preamp impedance matching...can anyone explain?


Hi, I currently have vintage tube gear, but want to try a SS amp with my tube preamp, and may try a SS preamp with my tube amps. I have noted there is an impedance matching issue, but do not understand it. Can anybody provide a quick summary?
Thanks
Jim
river251

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Does the voltage gain play into this at all? The amplifier I am using is a McCormack DNA-125, which has 30db of gain. Its input impedance is 100 kOhms. I am using an Audio Research SP8 MkII preamplifier with it which has an output impedence of 1,000 ohms.

I had Audio Research lower the gain in my SP8 recently, but needless to say, the volume through my Vandersteen 3A Signatures still gets loud in a hurry.

I was wondering if someone could please recommend a low gain, solid state Audio Research amplifier that is rated between 100-200 watts per channel? I do not want a tube amplifier, and I do not want to get rid of the wonderful SP8 MkII.