Sai
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Just bought a set from Grant Fidelity. Have about 30 hrs on them. I find them to be quite detailed, andneutral. They are built like tanks! Very nice structure, and the internals look well put together.
The only other KT88 tubes I’ve used are a set of NOS GEC tubes. Those are phenomenal but these IMHO are a worthy modern replacement albeit, at the moment, a brighter tube. I was able to tone the sometimes overly high extensions with darker preamp tubes (in my case Mullard E188CC and Mullard 12AU7s in my preamp).
Lows are nice and tight and have decent extension but not as much yet as my GECs. Mids are pretty flat.
All said though a solid tube and an excellent choice of KT88. They are not super “tubey” but then again most KT88 tubes are not as compared to say an EL34.
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