{"product_id":"shuguang-274b-rectifier-tube-full-wave-high-vacuum-5v-for-300b-2a3-tube-amplifier-hifi-audio-diy","title":"Shuguang 274B Rectifier Tube 1 Piece Full-Wave High Vacuum 5V for 300B 2A3 Tube Amplifier HIFI Audio DIY","description":"\u003ch1 dir=\"auto\" class=\"PDq2pG_selectionAnchorContainer\" style=\"text-align: center;\"\u003e\n\u003cmeta charset=\"utf-8\"\u003eShuguang 274B Rectifier Tube 1 Piece Full-Wave High Vacuum 5V for 300B 2A3 Tube Amplifier HIFI Audio DIY\u003c\/h1\u003e\n\u003cp dir=\"auto\" class=\"PDq2pG_selectionAnchorContainer\"\u003e \u003c\/p\u003e\n\u003ch2 dir=\"auto\" class=\"PDq2pG_selectionAnchorContainer\"\u003eModel No: SG-274B\u003c\/h2\u003e\n\u003cp dir=\"auto\" class=\"PDq2pG_selectionAnchorContainer\"\u003e \u003c\/p\u003e\n\u003cp dir=\"auto\" class=\"PDq2pG_selectionAnchorContainer\"\u003eThe \u003cstrong\u003eShuguang 274B\u003c\/strong\u003e is a high-performance, directly heated full-wave rectifier tube designed for high-voltage power supplies in tube amplifiers and other vacuum-tube audio equipment. Manufactured by Shuguang, it combines high-vacuum construction, carefully processed electrodes, and robust internal structure for stable and reliable rectification.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eA special cathode treatment is used to provide a smooth, durable emitting surface with strong electron emission. During production, the tube undergoes an extended evacuation process using high-vacuum equipment to achieve a high degree of internal vacuum. The tube is also subjected to high-voltage conditioning, helping improve stability and reliability when operating under elevated B+ voltages.\u003c\/p\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1105\/6138\/files\/274B_1.jpg?v=1789454514\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: center;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1105\/6138\/files\/274B_2.jpg?v=1789454532\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3 dir=\"auto\"\u003eFeatures\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-vacuum construction\u003c\/strong\u003e for stable high-voltage operation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpecial electrode processing\u003c\/strong\u003e for strong and consistent electron emission\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-voltage conditioning\u003c\/strong\u003e improves long-term stability\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003ePeak inverse voltage: over 850V\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eDC output current: over 150mA\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eFull-wave rectification for vacuum-tube amplifier power supplies\u003c\/li\u003e\n\u003cli\u003eDesigned to minimize arcing under normal high-voltage operating conditions\u003c\/li\u003e\n\u003cli\u003eSuitable for many \u003cstrong\u003e274B \/ 5U4G-type rectifier applications\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eIdeal for \u003cstrong\u003e300B, 2A3, 45 and other tube amplifier power supplies\u003c\/strong\u003e, subject to circuit requirements\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3 dir=\"auto\"\u003eTypical Specifications\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv dir=\"auto\" class=\"group TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\"\u003e\n\u003ctable dir=\"auto\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth class=\"last:pe-10\"\u003eParameter\u003c\/th\u003e\n\u003cth class=\"last:pe-10\"\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eTube Type\u003c\/td\u003e\n\u003ctd\u003e274B\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eFull-Wave Rectifier\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003eDirectly Heated\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeater Voltage\u003c\/td\u003e\n\u003ctd\u003e5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeater Current\u003c\/td\u003e\n\u003ctd\u003eApprox. 2A*\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePeak Inverse Voltage\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e≥ 850V\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDC Output Current\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e≥ 150mA\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBase\u003c\/td\u003e\n\u003ctd\u003eOctal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eManufacturer\u003c\/td\u003e\n\u003ctd\u003eShuguang\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eTube Amplifier High-Voltage Power Supply\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp dir=\"auto\"\u003e*The image supplied does not state the heater current; \u003cstrong\u003e5V\/2A is the conventional 274B specification and should be confirmed against the manufacturer's datasheet for this exact production version.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3 dir=\"auto\"\u003e274B and 5U4G Compatibility\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eThe Shuguang 274B is commonly used in applications where a \u003cstrong\u003e5U4G-style octal rectifier\u003c\/strong\u003e is specified. However, rectifier tubes should not be treated as universally interchangeable simply because their bases and pin connections are similar.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eBefore replacing a 5U4G, 5AR4\/GZ34, 5R4 or another rectifier with the 274B, verify the amplifier's \u003cstrong\u003eheater supply, transformer voltage, DC current requirement, first filter capacitor value and resulting B+ voltage\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3 dir=\"auto\"\u003e\u003cbr\u003e\u003c\/h3\u003e\n\u003ch3 dir=\"auto\"\u003eIdeal for Tube Amplifier Power Supplies\u003c\/h3\u003e\n\u003cp dir=\"auto\"\u003eWith its classic directly heated rectifier architecture and high-voltage capability, the Shuguang 274B is particularly well suited to traditional tube amplifier power supplies. It can be used in DIY and replacement applications for \u003cstrong\u003e300B SET amplifiers, 2A3 amplifiers, tube preamplifiers and other high-voltage vacuum-tube circuits\u003c\/strong\u003e where the electrical requirements are compatible.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eFor builders seeking a traditional full-wave vacuum rectifier with strong high-voltage capability and the characteristic behavior of a directly heated rectifier, the \u003cstrong\u003eShuguang 274B\u003c\/strong\u003e is a practical choice for both new builds and restoration projects.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003e \u003c\/p\u003e","brand":"IWISTAO HIFI MINIMART","offers":[{"title":"Default Title","offer_id":45499174977651,"sku":"SG-274B","price":38.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1105\/6138\/files\/274B_1.jpg?v=1789454514","url":"https:\/\/iwistao.com\/en-nl\/products\/shuguang-274b-rectifier-tube-full-wave-high-vacuum-5v-for-300b-2a3-tube-amplifier-hifi-audio-diy","provider":"IWISTAO HIFI MINIMART","version":"1.0","type":"link"}