  
Very clean, stable, free of microphonics. Very good tone in Fenders, Marshalls and Boogies.
We were very pleased with these new tubes - performance was great in our high performance amps.
These tubes are exact replacements for 12AX7, 7025 and ECC83 and will work in any amp, vintage or current manufacturer including: Fender, Gibson, Marshall, Torres Engineering, Vox, Alamo, Kalamazoo, HiWatt, Orange, Silvertone, Supro, Sound City, Matt, Traynor, Carvin, Silvertone, Bogen, Gretsch, Harmony, Valco, Wards, Airline, Kay, Krank, B-52, Ibanez, Epiphone, Crate, Ampeg, Danelectro, Peavey, Washburn, Sovtek, EH, Matchless, Mesa Boogie, Soldano, Park, Sundown, Rivera, Acoustic, Bogner, Sunn, Top Hat, Kitty Hawk, Laney,Top Hat, Trainwreck, Yamaha, Groove Tubes, MusicMan, Garnet, Selmer, Aims, Standel, Magnatone, Masco, Premier, Univox, Valco, Sho-Bud, Watkins, Tiesco, Dynacord, Johnson - and lots more!
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