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Type 6J5G was first introduced in 1936 the L63 was first introduced by Osram in 1938.\u003c\/p\u003e\n\u003cp class=\"MsoNormal\"\u003eThe 6J5G is effectively one half of a 6SN7GT. \u003cspan\u003e \u003c\/span\u003eIt finds use in many classic and current valve amplifiers.\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003e\u003cspan\u003e\u003cstrong\u003e\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003e\u003cspan\u003e\u003cstrong\u003e\u003cspan\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0885\/5784\/files\/6j5_pin.png?v=1756541820\" alt=\"\" width=\"421\" height=\"288\" style=\"display: block; margin-left: auto; margin-right: auto;\"\u003e \u003c\/span\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"text-align: left;\"\u003e\u003cspan\u003e\u003cstrong\u003e\u003cspan\u003e\u003cimg height=\"605\" width=\"421\" style=\"display: block; margin-left: 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