Tube tested 133/133 on my Eico 666 tube tester where 80 is listed as a minimum value. Excellent tube! Please email with any questions or concerns. Thanks for looking!
Item Tag: Amperex
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TWO Amperex 7591A Tubes / Amplitrex Tested STRONG 💪 +100% / Within 2% Gm Match
TWO Amperex 7591A vacuum tubes. Tested on Amplitrex AT-1000 tube tester (fixed bias mode). Tubes test at 10770 and 10600 where 6630 micromhos is pass/fail grade. +100% gm test results / matched within 2%.
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TWO Amperex 7591A Tubes / Amplitrex Tested STRONG 💪 +100% / Within 2% Gm Match
TWO Amperex 7591A vacuum tubes. Tested on Amplitrex AT-1000 tube tester (fixed bias mode). Tubes test at 10740 and 10950 where 6630 micromhos is pass/fail grade. +100% gm test results / matched within 2%.
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TWO Amperex 7591A Tubes / Amplitrex Tested / 90% Gm / Within 1% Gm Matched
TWO Amperex 7591A vacuum tubes. Tested on Amplitrex AT-1000 tube tester (fixed bias mode). Gm matched to within 1%. Tubes test at 9270 and 9320 where 6630 micromhos is pass/fail grade. 90.8% / 91.3% gm mutual conductance.
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TWO Amperex 7591A Tubes / Amplitrex Tested Above 90% / Within 3% Gm Matched
TWO Amperex 7591A vacuum tubes. Tested on Amplitrex AT-1000 tube tester (fixed bias mode). Gm matched to within 3%. Tubes test at 9550 and 9200 where 6630 micromhos is pass/fail grade. 93.6% / 90.1% gm mutual conductance.
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TWO Amperex 7591A Tubes / Amplitrex Tested / One SUPER STRONG, Two Good Singles
TWO Amperex 7591A vacuum tubes. Tested on Amplitrex AT-1000 tube tester (fixed bias mode). Tubes test at 11650 and 9690 where 6630 micromhos is pass/fail grade. 133% / 101.6% mA plate current. 114.2% / 95% gm mutual conductance.
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TWO Amperex 7591A Tubes / Amplitrex Tested Good Pair / 1979 World Globe Logo
TWO Amperex 7591A vacuum tubes. Tested on Amplitrex AT-1000 tube tester (fixed bias mode). Tubes test at 10010 and 10350 where 6630 micromhos is pass/fail grade. Gm matched to within 3.5% difference. No rattle / tight base / no loose parts.
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TWO Amperex 7591A Tubes / Amplitrex Tested / 1978 World Globe Logo
TWO Amperex 7591A vacuum tubes. Tested on Amplitrex AT-1000 tube tester (fixed bias mode). Tubes test at 9550 and 9800 where 6630 micromhos is pass/fail grade. No rattle / tight base / no loose parts.
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TWO Amperex 7591A Tubes / Amplitrex Tested 💪 +100% / 1978 Dates / 2% Gm Matched
TWO Amperex 7591A vacuum tubes. Tested on Amplitrex AT-1000 tube tester (fixed bias mode). Matched 78-13 date codes = 1978 week 13. Tubes test at 10800 and 10940 where 6630 micromhos is pass/fail grade.
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NOS NIB Matched Quad Amperex Sylvania 5814A Audio Tubes 1976
These are getting scarce and are a high end tube used by most of the professionals. Great for any high end a udio amplifier. These tubes are what audiophile enthusiasts are looking for. Th ese tubes were tested in my Military Hickok Cardmatic to make sure these were perfect.