4 Sylvania 12SN7GT 3-hole bad-boy tubes. on anAmplitrex AT1000 in fixed bias mode. AT1000 test results Good used testing and great sounding tubes. Tubes ran-in 5 min ea. before tests to ensure stability.
***** EVERYTHING WE SELL IS GUARANTEED 100% AUTHENTIC *****All tubes come with a full 30 day, unconditional, no questions asked, money back satisfaction guarantee!Test scores will average between 85% and 95% of NOS values. Individual test scores will be written on the boxes that you receive with your tubes. These tubes were carefully screened by the manufacturers (Baldwin, Allen, Conn, Hammond, Wurlitzer etc.) and specially selected for their low noise and microphonic characteristics.You are purchasing a "Platinum Plus" grade matched pair of tubes. This means that the plates are very tightly matched on a calibrated Hickok TV-7 or Hickok 799 within 1%. Please see our other listings for "Silver, Gold and Platinum" tubes. Silver Grade tubes are matched within 15%, Gold Grade tubes within 10% and Platinum Grade 5%. The Gold and Platinum Grade tubes are recommended for more critical applications such as your preamp and phono stage.The price listed is for one pair of tubes. To purchase more than one pair, when available, simply change the number in the quantity box which is located just below the advertised price. Please email with any questions and/or concerns.Thank you for viewing my listings.
You are buying a set of four tubes.
Silver Grade tubes are matched within 15%, Gold Grade tubes within 10% and Platinum Plus Grade 1%. You are purchasing a "Platinum Grade " matched pair of tubes. The price listed is for one pair of tubes.