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I had the MC-10L which used EL34's and 6N1 tubes. It appears yours uses 12AT7 which is probably good given you have a near unlimited opportunity for subs. I would search archives for 12AT7 subs for the pre tubes.
As for the EL34's My Yaquin came with Shuguang tubes which weren't bad. SED Wing C's are better. I ended up installing some Russian 6P3S-e's that were excellent (and cheap).
I no longer have my MC so the tube rolling has stopped.
A belated reply for other owners.
I have owned a Silk Audio MS-38 with Yaqin 6ca7 blue glass tubes for just over a year now.
It is a cosmetically modified version of the Yaqin MS20. I ran the supplied 5654 Chinese tubes for about 100 hours.
They did open up after about 40 hours, but the GE 5654's I replaced them with were immediately more refined. After burning in the sound was so sweet and emotionally involving I didn't want to turn it off! You could stop at that point, until the blue 6ca7s start to age.
I am now burning in a set of NOS Mullard 5654's and reissue Mullard cryo EL34s from Upscale Audio. Will report on my impressions soon....