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  1. Pearlman Tube - Gearspace

  2. Understanding 6SJ7 ideal operating conditions - Audiokarma …

  3. octal preamp tubes - 18Watt.com

  4. Little Dot Tube Amps: Vacuum Tube Rolling Guide - Head-Fi.org

  5. 6SJ7 - EL34 World

  6. 6SJ7 equivalents - GroupDIY Audio Forum

  7. 国鉄EF13形電気機関車 - Wikipedia

  8. The best 6SN7 just might be a 6J5-GT, 6J5-G or a British made L 63.

  9. Octal pentode sub for ef86? - diyAudio