I am not a football fan, and not much of a sports fan. So, the varous sports teams are not on my radar. I do listen to baseball games in the summer time, and I have a number of friends and associates who are Indians fans.
If you want, you can pack up the tubes and ship them to me, and I will identify any that are bad for you, since I have 2 tube checkers. Just put them in a shoebox wrapped in bubble wrap and fill up the space left over with packing peanuts. Identify the output pairs separately. I will check them for you, mark the bad ones and send them back. You pay the shipping, but no charge for scoping the tubes. My wish for success to another HIFI nut. PM me and I will give address to send to.
You also have the option of giving the amp to your service guy, with or without tubes, but with tubes is better, becasue you will need the tubes in the chassis to measure the voltages. Chances are your service guy will have a tube checker too, and be able to identify bad tubes. I would give the amp to your service guy and have him or her check the filter caps and the rectifiers and be sure that they have not leaked and lost capacitance. I just recapped my Dyna ST-120, which had a bunch of filter caps that had opened up and lost all capacitance over the years. New filters, stock values, improved performance noticeably, particularly in loud passages. You should also check coupling capacitors to be sure that you are not leaking DC onto grids of output tubes.
Anyway, good luck with your X-101. I think you will be pleased with the result, and it will certainly ready you for another 30 years of goood service.
And good luck from that slightly leaky, but well filtered old guy,