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RE: cathode bypass cap in Ultrapath: ClarityCap TC or Sprague

" Also, the Ultrapath implementation is supposed to take the cathode bypass cap out of the signal path (if I understand it correctly)."

The Ultrapath cap IS cathode bypass cap. (you did remove the cap between the cathode and ground?)

What a Ultrapath cap does is (effectively) remove the last cap in the power supply from the output tube's AC signal current path but the last cap in the power supply is now in the input (grid) signal path (along with the Ultrapath cap).

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