Depends if your direction is wanting to extend highs and smoother midrange with very low noise floor. The 12AX7s will effect your sound the most compared to the KT88s.
I would change the tubes in the preamp after you complete the MC2102. I put more money in my preamp tubes than the my MC275 amps. If I had to do it over I would have increase my money into my MC275 tubes using long plates with big warm sound and lower noise.
I would change the tubes in the preamp after you complete the MC2102. I put more money in my preamp tubes than the my MC275 amps. If I had to do it over I would have increase my money into my MC275 tubes using long plates with big warm sound and lower noise.