{"product_id":"12ax7-ecc83-dual-triode-valve-tested-measures-1-5ma-vacuum-tube-spare","title":"12AX7 ECC83 Dual Triode Valve Tested Measures 1.5mA Vacuum Tube Spare","description":"\u003cp\u003e12AX7 valve, tested and working, measuring 1.5 mA.\u003c\/p\u003e\u003cp\u003eThe 12AX7 (European equivalent ECC83) is a miniature dual (high-mu) triode fitted with a 9-pin Noval base, widely used in valve amplifier and preamplifier circuits.\u003c\/p\u003e\n\n\u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul class=\"key-spec-list\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTube Classification:\u003c\/strong\u003e Dual triode (twin triode)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEuropean Equivalent Designation:\u003c\/strong\u003e ECC83\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAmplification Factor (μ):\u003c\/strong\u003e 100\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSocket \/ Base:\u003c\/strong\u003e 9-pin miniature (Noval B9A \/ EIA 9A)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Anode Voltage:\u003c\/strong\u003e 300 V\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul class=\"spec-list\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAudio Inputs:\u003c\/strong\u003e 1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eYear Manufactured:\u003c\/strong\u003e 1950s\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Brand:\u003c\/strong\u003e \u0026lt;UNKNOWN\u0026gt;\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Model:\u003c\/strong\u003e 12AX7\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTube Classification:\u003c\/strong\u003e Dual triode (twin triode)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEuropean Equivalent Designation:\u003c\/strong\u003e ECC83\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeater Voltage:\u003c\/strong\u003e 6.3 V (parallel) \/ 12.6 V (series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAmplification Factor (μ):\u003c\/strong\u003e 100\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTransconductance (Gm):\u003c\/strong\u003e 1.6 mA\/V (1600 µmhos)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlate Resistance:\u003c\/strong\u003e 62.5 kΩ\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHeater Current:\u003c\/strong\u003e 300 mA (parallel) \/ 150 mA (series)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Anode Dissipation:\u003c\/strong\u003e 1 W per section\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Anode Voltage:\u003c\/strong\u003e 300 V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePhysical Dimensions:\u003c\/strong\u003e Height: 2.2 in (56 mm); Diameter: 0.8 in (20 mm)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCathode Type:\u003c\/strong\u003e Indirectly heated\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTypical Operating Point (Class-A):\u003c\/strong\u003e Anode voltage 250 V; Anode current 1.2 mA; Bias −2 V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNotable Equivalent \/ Variants:\u003c\/strong\u003e ECC83 (European), 7025 (low-noise US), 5751 (military, μ=70)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTube Type:\u003c\/strong\u003e Miniature dual (twin) triode — high-mu\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSocket \/ Base:\u003c\/strong\u003e 9-pin miniature (Noval B9A \/ EIA 9A)\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Chorlton Analogue","offers":[{"title":"Default Title","offer_id":62721719566723,"sku":"395A","price":15.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1610\/2401\/files\/12_3f9f9abb-5e66-4f17-92fb-545dd78d65a7.jpg?v=1790765386","url":"https:\/\/chorltonanalogue.com\/products\/12ax7-ecc83-dual-triode-valve-tested-measures-1-5ma-vacuum-tube-spare","provider":"Chorlton Analogue","version":"1.0","type":"link"}