It's time to replace Shuguang 845B tubes in my amp. I found Psvane 845-HIFI series tubes. Are they any good? better then Shuguang 845B? Price is about the same. Are they interchangeable?
I believe the Psvanes are made by Shuguang perhaps with tighter tolerances and QC for the "higher" quality Psvane is supposed to represent. I can't tell you however, with certainty, that the 2 845s you mentioned are identical electrically.
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