{"product_id":"thordarson-21f12-filament-transformer-117-vac-50-60-hz","title":"THORDARSON 21F12 FILAMENT TRANSFORMER 117 VAC 50\/60 HZ","description":"\u003ch3 data-section-id=\"17lc1ru\" data-start=\"0\" data-end=\"16\"\u003eDescription:\u003c\/h3\u003e\n\u003cp data-start=\"18\" data-end=\"638\"\u003eThe Thordarson 21F12 Filament Transformer is used in vacuum tube electronic equipment to supply regulated low-voltage AC power for heating the filaments of receiving and transmitting tubes. Commonly installed in vintage tube amplifiers, radio transmitters, \u003ca href=\"https:\/\/plgautomation.com\/collections\/networking-communication\"\u003ecommunications\u003c\/a\u003e equipment, laboratory instruments, and custom vacuum tube power supplies requiring a 6.3 VAC center-tapped filament source. Electronic technicians, audio restoration specialists, and \u003ca href=\"https:\/\/plgautomation.com\/collections\/hmi-operator-interfaces\"\u003esystem integrators\u003c\/a\u003e use this transformer for equipment repair, restoration, replacement, and custom tube amplifier construction. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5ms9th\" data-start=\"640\" data-end=\"657\"\u003eApplications:\u003c\/h3\u003e\n\u003cp data-start=\"659\" data-end=\"1109\"\u003eThe Thordarson 21F12 is designed to provide isolated filament power for vacuum tube circuits while maintaining stable voltage under continuous operation. It is widely used in guitar amplifiers, hi-fi audio amplifiers, amateur radio transmitters, vintage communications receivers, laboratory power supplies, and electronic restoration projects where reliable heater voltage is essential for proper tube operation. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"5hg6bl\" data-start=\"1111\" data-end=\"1140\"\u003eTechnical Specifications:\u003c\/h3\u003e\n\u003cp data-start=\"1142\" data-end=\"1891\"\u003e• Brand: Thordarson\u003cbr data-start=\"1161\" data-end=\"1164\"\u003e• Part Number: 21F12\u003cbr data-start=\"1184\" data-end=\"1187\"\u003e• Product Type: Filament Transformer\u003cbr data-start=\"1223\" data-end=\"1226\"\u003e• Primary Voltage: 117 VAC, 50\/60 Hz\u003cbr data-start=\"1262\" data-end=\"1265\"\u003e• Secondary Voltage: 6.3 VAC Center-Tapped (CT)\u003cbr data-start=\"1312\" data-end=\"1315\"\u003e• Secondary Current Rating: 10 A\u003cbr data-start=\"1347\" data-end=\"1350\"\u003e• Transformer Type: Isolation Filament Transformer\u003cbr data-start=\"1400\" data-end=\"1403\"\u003e• Dielectric Test Voltage: 2,500 VAC\u003cbr data-start=\"1439\" data-end=\"1442\"\u003e• Mounting Style: Chassis Mount\u003cbr data-start=\"1473\" data-end=\"1476\"\u003e• Lead Terminations: Flying Leads\u003cbr data-start=\"1509\" data-end=\"1512\"\u003e• Cooling Method: Natural Air Cooling\u003cbr data-start=\"1549\" data-end=\"1552\"\u003e• Frequency: 50\/60 Hz\u003cbr data-start=\"1573\" data-end=\"1576\"\u003e• Construction: Enclosed Laminated Core Transformer\u003cbr data-start=\"1627\" data-end=\"1630\"\u003e• Approximate Weight: 2 lb 10 oz (1.2 kg)\u003cbr data-start=\"1671\" data-end=\"1674\"\u003e• Country of Manufacture: United States\u003cbr data-start=\"1713\" data-end=\"1716\"\u003e• Typical Applications: Tube Amplifiers, Radio Equipment, Communications Systems, Laboratory Electronics, and Vacuum Tube Power Supplies. \u003cspan class=\"\" data-state=\"closed\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3 data-section-id=\"1cz0398\" data-start=\"1893\" data-end=\"1917\"\u003eCommon Replacements:\u003c\/h3\u003e\n\u003cp data-start=\"1919\" data-end=\"2083\" data-is-last-node=\"\" data-is-only-node=\"\"\u003e• Thordarson 21F204 Filament Transformer\u003cbr data-start=\"1959\" data-end=\"1962\"\u003e• Thordarson 21F193 Filament Transformer\u003cbr data-start=\"2002\" data-end=\"2005\"\u003e• Thordarson 21F103 Filament Transformer\u003c\/p\u003e","brand":"THORDARSON","offers":[{"title":"New","offer_id":51714021294382,"sku":null,"price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_0a89d203-2177-4a6c-b852-949b328e6ed0.jpg?v=1770414016","url":"https:\/\/plgautomation.com\/products\/thordarson-21f12-filament-transformer-117-vac-50-60-hz","provider":"PLG Automation ","version":"1.0","type":"link"}