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That is very low for a tube amp but the Lamm L2 Reference is 130 Ohms. The McIntosh C1000T is about 220 Ohms. Both are about $17,000.

Arthur

Wow - that LS36.5 looks really nice for the money. Very impressive circuit design. It is interesting that they use output transformers (in a preamp) to get low output impedance - I think that is what Lamm does too but I am not sure about the McIntosh.

Arthur

With 20k input, you will be fine with any preamp below 350 or so. No sweat.

Arthur