2x TESLA ECC83 (=12AX7 B339 6L13 CV492), Foil Getter, 11/12 1958, Old-Style Logo, Test 100%++. For your consideration: 2 pieces of original 1958 TESLA ECC83 tubes. They feature foil disc getter on a large and robust support, smooth folded plates, non-corrosive pins, and yellow prints.
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