Svetlana 6550B-3 Tubes Lot of 4Made in Russia old St. Petersburg Svetlana tube factory vintage early 90's The 6550B-3 has no getter splash on the top and two rings on the side outside the plate which are solid centered and hold getter material which is not splashed on the glass. This tube is referred to as a “clear top”. Condition Used Tested Tube Tester reads: Tube 1: 45 Tube 2: 53 Tube 3: 52 Tube 4: 52 Minimum 44 All tubes are tested on a Mil-spec TV7 tube tester that has been professionally calibrated by Paul Hart. As with all vintage items we sell As-Is,Sale Final.
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