I have been rolling tubes mostly signal tubes in my MC275 VI and can clear hear some differences. The difference that the signal tubes will make is in this order per my experience, V3/5(phase inverter 12AX7)>V2/6 (output drive 12AT7)>V1/V7 (buffer or cathode follower 12AT7)> power tube (KT88). Gold Lion Reissue 12AX7 sounds warm and lush, but not as transparent as NOS German tubes, such as Telefunken and Siemens. Siemens is less warmer than GL, but very smooth and more details. For 12AT7s, I have compared among GL, Siemens and Mullard (military style, made in UK in 60s). Mullard is the best since it is warmer than Siemens and with more details than GL. I plan to try Psvane KT88-T-MK II next since I have them in MC2301 and they sound very nice.
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