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SED (Svetlana) Winged =C= KT88 Matched Quad - output beam tetrode made by Svetlana factory in st.Petersburg.
Perfect choice for guitar, hi-fi/hi-end amplifier. Best sounding KT88 tubes.
Price is for Matched Quad.
All tubes are tested on famous russian tube tester L1-3 (L3-3).
Datasheet:
High Performance Audio Power Tube KT88