RCA 12AX7 A Finest USA New Old Stock 12AX7 Dual Triode for Quality Tone in Guitar Amps and Musical Sonics in Hi-Fi Amps and Preamps Made with the highest quality in the 1950-60s in Harrison, NJ USA Hand-Selected for lowest noise and microphonics, balanced triodes. New in original RCA Factory Box - 10,000 hour+ lifetime. Genuine Vintage NOS USA Made Tube-THE REAL THING! Original equipment in the best-sounding vintage guitar amps and hi-fi amps from the 1950s and 1960s