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I own a Blackstar HT Series HT-DISTX Tube High Gain Distortion Guitar Effects Pedal. After a couple of years I felt I should replace the tube. At the music store a cleark gave me a 12AX7 tube. After installation it sounded too distorted and muddy so looked closer at the tube I had re4moved and realized it was an ECC83-WA not a 12AX7. Close but no cigar. The ECC83-83 is crisper and give me the highs that I had grown accustomed to. Thanks Antique Electronic Supply. I'm whole again.
