12AT7 Siemens Halske Germany D getter NOS 1957 (6ma/8ma) Title: 12AT7 Siemens 1957

1 low noise tube) 12AT7 Siemens large D getter NOS 1957 copper grid posts

1 section) 8ma Gm=5200

1 section) 6ma Gm=4400

Good Ma range 8-10ma

Good Gm range 5000-5500

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