I have one NOS PHILCO Type # 50 Single Black Plate vacuum tube. I tested it today using my calibrated TV-7D/U and with minimum of 38 it tested 63. Rare to find a new one! $7.75 shipping
Item Category: Vintage Electronics
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National Union 483 Type 45 Globe Tube 5 Volt Power Triode Black Plate Engraved
Aquired from a life long collector on the West Coast.
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Matched Pair RCA 5V4G Rectifier Tubes Black Plates D Getters Tests Strong TV-7BU
Matched Pair RCA 5V4G Rectifier Tubes Black Plates D Getters. Tube 1 tests at 60/60 and tube 2 at 56/58 with 40 being the minimum score for a good tube (with 65% life remaining).
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LUnited 805 JAN VT-143 Transmitting Tube Black Plates Tested Strong
Excellent filament tested at 1000V- Rk: 1.5k- Rg:470k. The results were well above 100 m/a
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2 Plate Current Matched Tung-Sol 6550 Black Plate Tubes USA 1960
These are getting scarce and are a high end tube used by most of the professionals. Great for any a udio amplifier. These tubes are what audiophile & guitar enthusiasts are looking for. These tubes are used, but the flashings and test results indicate long hours of play left in them.
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RCA 6L6GC – 100% MATCH – Quad Black Plates 1963, 1963, 1966, 1966, Grade A
Quad RCA 6L6GC Black Plates “Excellent GRADE A Tubes”- Test Results (see pictures of the test system). Good tubes will maintain a constant output under load at less than 1% THD. We listen to our tubes for one hour in ourRCA MI 9377A quad power amplifier.
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EL34/6CA7-Z Shuguang Treasue Series matched pair(2) pcs tone masters
This results in a natural distortion free sound that is as good as or better than the old style NOS tubes. These are supplied in matched pairs. Two (2) per lot. AAAAA+++++. The Gov’t is collecting high duty on small parcels from China.
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6C8G Sylvania Oak Leaf Bottom Dimpled Foil Getter Black Plates Preamp Tube Rare
Black winged cylinder plates and a bottom dimpled foil getter with a top cap in an ST envelope. this Tube was tested on the Jackson 103 tester were the minimum good is 25 and the average NOS reading for this Tube type is 36.
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NOS NIB Matched Pair Sylvania 7189 Black Plate Vacuum Tubes
These were was tested on our Triplett 3444A tester with results of 11000 and identical plate currents for both tubes, where 11000 is the average new value. Do not buy this item and then ask us to falsify the forms.