Sweet. I am getting excited about this. I have my 4 modules and have plans to rack them up all together in a different chassis.
Curious about the output impedance, would a step down transformer help with this (say 4:1)? Obvious answer is yes, but then again I'm still learning about toobs!
Also if I did use the 12ax7 as a cathode follower, could a use one side of the 12ax7 for one channel CF and another side for another channels CF or would the cross-talk be a possible issue?
Interesting about putting the volume control after the EF86, would the 500k work there or something higher like 1M? I like the idea, do you think a pad should be added (would the ef86 stage possibly overload or is the 250V rail large enough?)
Thanks for being patient with these rather primitive questions. It does help a lot!