my amp has an input impedance of 75K ohms, and the pre i'm thinking of purchasing has an output impedance of 135 ohms. Is this ok? the amp is SS and the pre is tube. thanks
Yes, you need to match the preamp to the EQ box. I don't think you'll have any problem - the input impedance will likely be at least 75K, and as others have mentioned, that is high enough.
In that case, it's the Theil EQ box that's driving your power amps. The output impedance of your preamp is irrelevant as far as your power amps are concerned. The Theil EQ box will eliminate any direct interaction between preamp and power amps. I expect that the EQ box, having a solid state output stage, has a pretty low output impedance (have any specs on it?).
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