{"product_id":"fosi-audio-gr70-tube-headphone-amplifier-preamp-class-a-vacuum-tube-amp-with-5654w-2-6ж4-2-3-5mm-6-35mm-jack","title":"ឧបករណ៍បំពងសម្លេងកាសស្តាប់ត្រចៀកបំពង់ Fosi Audio GR70 Preamp Class A Vacuum Tube Amp ជាមួយរន្ធដោត 5654W*2 និង 6Ж4*2 3.5mm និង 6.35mm","description":"\u003ch1\u003eSPECIFICATIONS\u003c\/h1\u003e\u003cp\u003e\u003cspan\u003eBrand Name\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eFosi Audio\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eCertification\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eCE\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eControl Method\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003ePush button\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eDynamic Range\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e97db\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eFOSI AUDIO Model\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eGR70\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eFrequency Response\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e20Hz-20kHz\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eHigh-concerned chemical\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003enone\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eMaterial\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eMetal\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eMaximum Power Per Channel\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e60 W\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOrigin\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eMainland China\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eOutput Power\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003e60MW\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003ePackage\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eYes\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan\u003eSurround sound channel configuration\u003c\/span\u003e: \u003cspan style=\"color:#333\"\u003eOthers\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003ckse:widget data-widget-type=\"customText\" id=\"1005000000920131\" type=\"custom\"\u003e\u003c\/kse:widget\u003e\u003c\/div\u003e\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003c\/div\u003e\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003cspan style=\"background-color:rgb(252, 220, 0);font-size:20px\"\u003e\u003cstrong\u003eNote\u003c\/strong\u003e\u003c\/span\u003e\u003c\/div\u003e\u003cp\u003e\u003cspan style=\"background-color:rgb(252, 220, 0);font-size:20px\"\u003e\u003cstrong\u003eStarting from 2025.12.25, we will send 6Ж4 or 6Ж8 tubes randomly.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cimg width=\"944\" height=\"393\" src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sc3701beafa364ea999f98e3cd7fe8b1bV.jpg\" slate-data-type=\"image\"\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_html\"\u003e\u003cdiv class=\"detail-desc-decorate-richtext\"\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003cdiv\u003e\u003cdiv\u003e\u003cdiv class=\"detailmodule_media\"\u003e\u003cdiv class=\"video-container-5000257714043\"\u003e\u003cdiv class=\"detail-video\" id=\"5000257714043\" data-previewurl=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S709537553a7c4a8992312a90171bca20l.jpg\"\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cp style=\"font-family:OpenSans;font-size:20px;font-weight:900;line-height:28px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-title\"\u003eFeature\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cp style=\"font-size:16px\"\u003e1.Pure Tube-Amplification\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003eThe GR70 headphone tube amp combines vintage charm with modern tech, delivering authentic tube essence. Perfect for headphone enthusiasts, it pairs excellently with over-ear and in-ear headphones for superior audio\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cp style=\"font-size:16px\"\u003e2.Replaceable Tubes for Custom Sound\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003eFeatures two 5654W and two \u003cspan\u003e6Ж4\u003c\/span\u003e vacuum tubes for two-stage amplification. The 5654W tubes boost voltage, while the \u003cspan\u003e6Ж4\u003c\/span\u003e tubes handle power amplification. This setup delivers balanced, transparent, and textured sound.Users can swap tubes to explore different sound effects, adding playability and flexibility for personalized customization.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cp style=\"font-size:16px\"\u003e3.User-Friendly Design\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003eThis tube headphone amp preamplifier offers intuitive controls, including a large volume knob, dual-side ventilation holes, bass \u0026amp; treble controls, high and low impedance mode switching, making it versatile enough\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cp style=\"font-size:16px\"\u003e4.Free Switching Impedance Mode\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003eIt supports low and high impedance modes switching to adapt 16Ω-300Ω headphones, and features 6.35mm\/3.5mm headphone jacks on the front and RCA Input\/Output on the rear for home audio HiFi system integration\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cp style=\"font-size:16px\"\u003e5.Compact Yet Powerful:\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003eCrafted with a CNC-machined aluminum alloy body, the GR70 is both durable and refined. Despite its compact size, it delivers up to 300mW power output and 1.2V RCA output with SNR ≥97dB—offering warm, clean, and dynamic sound\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_text\"\u003e\u003cp style=\"font-size:13px\"\u003eModel: GR70\u003cbr\u003eBass and Treble Adjustment: YES\u003cbr\u003eTubes: \u003cspan style=\"background-color:rgb(252, 220, 0);font-size:14px\"\u003e\u003cstrong\u003e6Ж4 or 6Ж8\u003c\/strong\u003e\u003c\/span\u003e×2, 5654 ×2\u003cbr\u003eSignal Input Mode: RCA\u003cbr\u003eOutput: 3.5mm headphone + 6.35mm headphone + RCA full-range signal output\u003cbr\u003eRated Output Power: 90mW\u003cspan\u003e@32Ω\u003c\/span\u003e\u003cbr\u003eInput Voltage and Current: 12V 3A\u003cbr\u003eSignal-to-Noise Ratio: ≥97dB\u003cbr\u003eFrequency Response: 20Hz-20kHz (±1dB)\u003cbr\u003eDynamic Range: 97dB\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_text\"\u003e\u003cp style=\"font-family:OpenSans;font-size:20px;font-weight:900;line-height:28px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-title\"\u003eQA:\u003c\/p\u003e\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cp style=\"font-size:16px\"\u003e\u003cstrong\u003eQ1:Why are there two types of bile duct combinations?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003e\u003cstrong\u003eA:The 5654W tubes boost voltage, while the 6AC7 tubes handle power amplification.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cp style=\"font-size:16px\"\u003e\u003cstrong\u003eQ2：Can GR70 work without a pair of electronic tubes?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003e\u003cstrong\u003eA: NO\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_text\"\u003e\n\u003cp style=\"font-size:16px\"\u003e\u003cstrong\u003eQ3:Is it recommended to use other electronic tubes in combination?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"font-family:OpenSans;font-size:14px;font-weight:300;line-height:20px;white-space:pre-wrap;color:rgb(0, 0, 0);margin-bottom:12px\" class=\"detail-desc-decorate-content\"\u003e\u003cstrong\u003eThe combination of GR70 with electronic tubes is already the best combination we have tested. You can test the effect of other electronic tube combinations by yourself\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"font-size:16px\"\u003e\u003cstrong\u003eQ4Which tube models can replace the 6Ж4 tube?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eYou may replace them with 6AC7, 6J4, or CV849 vacuum tubes.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_image\"\u003e\n\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S5f1b87353fba4713ad99a41dc607d944B.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sb89a993396044beea2f1cfe9e2f9524cv.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sedffc399686b4e4da20795507a98d87cZ.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S2ecb5dfd790049089ac594baf7906de9v.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Scbe0509757184cbeb503c04ecb529e46I.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sd3de4efb1050408bbd0d3754f17a3da4o.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sdc290df886264d7c8f3719cff4b9edbcD.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S52b9e635dbcf4139bbafc3d0f8b7030bz.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S8e4c72f42bc145d8a19860608895d59ea.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S2b613303b0c7429789293017acd2c152k.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S8950f273a642440191563716679c9d239.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S649df336df044a66865c04228423639eV.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S520633e323344d11bbaa0ea3f48039f9y.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sf190f89faf0a41188c02eca65f50fa17D.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S1f1bd5561f90455c9ec91743c6516eb32.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S116c1fc7ec614304ab2f8959861dcaeeG.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/Sb4961bbf19f043fda2f25919aa4fab14L.jpg\" slate-data-type=\"image\"\u003e\u003cimg src=\"https:\/\/ae-pic-a1.aliexpress-media.com\/kf\/S8e8c6163c93b42ff8afbf815259080f9P.jpg\" slate-data-type=\"image\"\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\n\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\u003c\/div\u003e\u003cdiv class=\"detailmodule_dynamic\"\u003e\u003ckse:widget data-widget-type=\"customText\" id=\"1005000024963203\" type=\"custom\"\u003e\u003c\/kse:widget\u003e\u003c\/div\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Fosi","offers":[{"title":"GR70 black \/ US PLUG \/ China Mainland","offer_id":46738002411716,"sku":"1005009195521693-GR70 black-US PLUG-China 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Mainland","price":190.99,"currency_code":"USD","in_stock":true},{"title":"GR70 black \/ UK PLUG \/ China Mainland","offer_id":46738002608324,"sku":"1005009195521693-GR70 black-UK PLUG-China Mainland","price":190.99,"currency_code":"USD","in_stock":true},{"title":"GR70 orange \/ EU PLUG \/ China Mainland","offer_id":46738002641092,"sku":"1005009195521693-GR70 orange-EU PLUG-China Mainland","price":190.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2430\/7881\/files\/Sd2395ce2cb6f42cdaa97db57534328ca1.webp?v=1789705842","url":"https:\/\/www.darahub.com\/products\/fosi-audio-gr70-tube-headphone-amplifier-preamp-class-a-vacuum-tube-amp-with-5654w-2-6%d0%b64-2-3-5mm-6-35mm-jack","provider":"DARAHUB","version":"1.0","type":"link"}