First Thanks for your help. The 360 360 I meant a 360-0-360 CT trans. I always understood the bypass cap on the cathode acted to eliminate the feedback through the cathode resistor. Why is the low plate voltage better for sound on the 5687? I have read that that tube sounds better with higher B+, but the Audio Note runs 200 v on the plate while the modified unit runs 330v. How does mixing tube and SS in the rectification circuit help? I warned you this was baby steps! Thanks again, you see this is such a radical change from the original we have to recharge the Dilithium Crystals.
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