AMPLITREX TESTED 4-Piece NIB / NOS Tightly Matched Quad of Westinghouse 7C5 Power amplifier tubes.  The 7C5 is the 8-pin Loktal equivalent to the 6V6GT.  Feature black plates with a top "O" getter.   Test SUPER STRONG.  Results:

TUBE 1:  4,280 mhos (104%) / 47.6 mA (105%)

TUBE 2:  4,460 mhos (108%) / 44.4 mA (98%)

TUBE 3:  4,460 mhos (108%) / 47.8 mA (106%)

TUBE 4:  4,650 mhos (113%) / 50.6 mA (112%)

NEW spec average for this type is 4,100 mhos (100%) / 45.0 mA (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).