12AT7 (1410) - GOLD PINS MULLARD 10M SERIES - ORIGINAL BOX & PACKING FOAM (STARTING TO DISINTEGRATE DUE TO AGE)
GM = 3.5 & 4.04 mA/V
Mu = 58.8 & 62.5
EXTREMELY HEALTHY EMISSION
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12AT7/ECC81 DATASHEET NOMINAL @ 250V/-2V IS 10mA PLATE CURRENT & ~ 5.5mA/V GM AND 60 Mu