Long, smooth, grey, 17 mm plates, halo getter. Straight pins, good, original logos, excellent silvering. Tubes are matched inside and out for structure and test at 2900-2800, 2800-2650, where pass/fail is 1400 micromho.
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These are results for a high emission and long workting tubes. The desired result in the application is therefore purely random.
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ECC82 12AU7 Valve Tube. NOS, Supplied in White Box. Long Ladder Plates, Halo Getter.
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These are results for a high emission and long working tubes. The desired result in the application is therefore purely random. <> diamond on bottom. Gm: 2,300 + 2,300 and 2,340 + 2,320 (100% = 1,800.2,600).
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These are results for a high emission and long working tubes. The desired result in the application is therefore purely random. <> diamond on bottom. Tested in auto bias mode.
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Tubes are identical in construction. Construction: long smooth gray plate round getter. Tested at: 124/115 plate current 15/13.5. The minimum is equal to 65% of the life of the tube. 125/126 plate current 14.9/14.8.
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2x TESLA ECC802S / 12AU7WA. of original TESLA ECC802S tubes. These are industrial-grade tubes made for army or aerospace use, and other demanding applications. Datecodes: FW = 4/1974. Tube 2: Ia1=3.10mA / Ia2 =3.40mA, S/gm1= 1.10 mA/V / S/gm2= 1.20 mA/V.
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A tube was considered acceptable/new/ passed standards if it tested between the specified minimum and maximum on a tube data sheet or the minimum value specified on the tester (tv7 is minimum is 65%).
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