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NIB NOS Matched Pair RCA 6661 6BH6 BLACK Plate Marantz 8B AMPLITREX Test STRONG, US $310 – Picture 0
NIB NOS Matched Pair RCA 6661 6BH6 BLACK Plate Marantz 8B AMPLITREX Test STRONG, US $310 – Picture 0

Nib Nos Matched Pair Rca 6661 6bh6 Black Plate Marantz 8b Amplitrex Test Strong

US $310

  • Elkhorn, Wisconsin, United States
  • Nov 11th
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AMPLITREX TESTED NIB / NOS Matched Pair of RCA 6661 Pentode tubes.  This is the industrial / military grade version of the 6BH6 and can directly replace them in the Marantz 8B.  Feature black plates and a top "O" getter.  Test STRONG.  Results: TUBE 1:  4,200 mhos (93%) TUBE 2:  4,400 mhos (98%) NEW spec average for this type is 4,500 mhos (100%).     All tested tubes are analyzed on a new Amplitrex AT1000 digital tester.  The AT1000 is the most accurate and reliable tester ever made.  All tubes are tested for heater-to-cathode leakage / shorts, emissions, transconductance, and a gas test.  In most cases, I will provide a computer generated spreadsheet of the comprehensive results for your records.  In either case, emission and / or transconductance measurement will be posted on every tube box for your convenience.       Results will be given with the actual number measured and then a generated percentage.  This percentage is based on specification values of a NEW tube so you know how good a tube is.  Ideally, a "new" tube should read at 100% or greater, but some NIB / NOS tubes will test in the middle to upper 90 percentile.  Tubes that test "NEW / NOS"  may not necessarily be true NOS.  New in the box tubes will be listed as NIB.  Two or more tubes are considered "matched" as long as they test within 10% of each other for emission (mA) or transconductance (mhos).  

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