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RE: Oh my...I suppose replacing V3 with a better tube will improve the sound, but I sure wouldn't...

Posted by Lew on March 30, 2017 at 07:25:44:
I don't know what is inside that CV181-like glass envelope that Sophia uses. If it's a 6SN7 internally, then using them is fine. On the other hand, if it's truly built to CV181 specifications, then keep in mind that the filaments draw 0.95A. That's 50% more current than a 6SN7 filament. If you use 3 or 4 of the Sophia tubes in an M60, it might be stressing the filament supply. Probably using one or two is OK. This issue would be in addition to any issue arising from alteration of the operating points of the tube itself, if it's a CV181.