Here is one blackplate that tests very strong with no gas, no shorts, perfect getter-flashing and excellent life-test. This tube has three support posts and three 'D' shaped top getters. It has two defects neither of which affects performance, i.e., (1) the positioning key is missing and, (2) the top mica is slanted.3225812-3 Gm = 6000 / where 6500 = AVERAGE NEW MEASUREMENT / and 4095 = JAN MIN
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