I think you will need one custom made. The stock unit only goes up to 400K.
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Oh, I'm not saying there ISN'T one, just wondering which one it is. My McCormack was 100K Ohm before I had it modded (now 10KOhm), and I thought that was high! I have thought about perhaps having a dedicated filter made for this amp to avoid the dip-switch circuity. Wondering if it would be worth the efoort.