I'm currently using Psvane 845T tubes from Grant Fidelity and like them better than any others I've tried. BUT I've bought a lot of 845s from Sophia and never blew any (over an 8-year period) while one of the 845Ts died after 14 months. So I would say you might have an amplifier issue rather than a tube issue. Have you used any other 845 tubes except the ones from Sophia, and how did they fare?
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