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1 matched pair) EL84 Siemens Halske Germany 1969 (km4 Series) same date codes in white boxes
1 tube) 47.5ma, Gm=10,900
1 tube) 50.4ma, Gm=11,800
Matched on Amplitrex
Good Ma range 40-48ma
Good Gm = 10K-12K