Coincident Dragon MK I vs MK II

Erndog,
This is good to hear. That amplifier is transparent and very uncolored, so power cord,cables and tube changes will be quite apparent.The Dragon as expected responds significantly to this type of fine tuning.You` re on the right track, just continue to trust your ears.
Regards,

Hello Erndog,
You have found a very nice recipe that works for you and to stick with, just season to your taste.
I love the 300b as does Charles. (currently using Sophia RP.)
My Pre has XLR out and I declined to use an adapter so I commissioned Tempo Electric, Joseph Levy, for XLR/RCA IC cable. You are about there... I would like to be there to listen...

I'm really enjoying getting this amp dialed in. So far everything I've done has produced a good result.

For whatever reason, I don't hear much about the 6EM7 input tube for the Dragon. Are people rolling this one too? I'm not sure how much of an impact this tube makes. Mine came with some NOS Sylvanias.

There aren`t many choices of the 6em7 available, you might as well stick with what you have.