New idea popped in my head. This will replace the Prologue 2.0 build for now. The new setup just omits the 1626 tube and I can always add that back later. The same transformers and parts will go into this amp.
The idea was to eliminate the cathode bypass cap, so I will hook up the cathode to the heater and add a current source to light up the tube and create a 2V drop for the tube bias. This means the cathode resistor will be so low (3.3R) that it will have next to no effect on the overal output impedance or the LF response.
Project link here
Trying hard not to electrocute myself...