GREY PLATE, SQUARE GETTER. TESTED NEW AND UNUSED.
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Date codes k61 B7L & k61 B5I. Pair of Mullard 12AU7 long plate tubes with square getters. These feature the older shield logo and 1955 & 1957 date codes. These test in the 80-90% range, and check quiet on the Amplitrex AT1000.
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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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selling 10 12au7 tubes and 10 12at7 tubes all test strong on my tester
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BRIMAR CV491 ECC82 VALVE NEW OLD STOCK GOOD QUALITY CHEAPEST ON EBAY BY FAR
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I am selling a pair of these lovely tubes from my collection. I have owned them for 10 years and they test as new, I have tried them in my Audionote M8 preamp and they are extremely quiet no microphony at all. Matched pair Amperex long plate 17mm, D-foil getter, Top seams. Originally labelled Beckmann but label is now mostly erased These have the CT0 marking etched into the glass designating them to be the 7316 variant Tube 1 Delta 8K 1958 Tube 2 Delta 8I 1958 As measured on my VCM 163 tube tester Ma and Gm for each section shown below Tube 1 A1 10ma; A2 11ma: A1 2ma/V; A2 2ma/V Tube 2 A1 12ma; A2 11ma: A1 2.3ma/V; A2 2.2ma/V Where new tube is 10ma gm 2.2
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