{"product_id":"douk-audio-f2-single-ended-class-a-tube-amplifier-hifi-stereo-audio-integrated-tube-amp","title":"Nobsound F2 HiFi Single-Ended Class A Tube Amplifier","description":"\u003cdiv\u003e\u003cspan\u003eFeatures\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cul\u003e\n\u003cli data-end=\"253\" data-start=\"0\"\u003e\n\u003cp data-end=\"253\" data-start=\"3\"\u003e\u003cspan\u003eTrue Class A Tube Warmth: Enjoy the rich, smooth tone of a single-ended Class A vacuum tube amp. F2 brings lifelike detail and natural dynamics to your home setup, perfect for relaxed, immersive listening with matched speakers. \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"504\" data-start=\"255\"\u003e\n\u003cp data-end=\"504\" data-start=\"258\"\u003e\u003cspan\u003eTube Rolling Friendly Design: All tubes are pluggable, letting you fine-tune the sound. Default with 5U4G, 6SN7GT and 6CA7 tubes. Enjoy the freedom to personalize tone and texture based on your gear and musical taste.  \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"764\" data-start=\"506\"\u003e\n\u003cp data-end=\"764\" data-start=\"509\"\u003e\u003cspan\u003eBuilt with Audiophile-Grade Parts: From a robust 160W transformer with Japan Z11 steel core to ALPS precision potentiometer and gold-plated terminals, F2 uses premium parts to reduce noise and elevate musical detail, bringing out the best in every track.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-end=\"1028\" data-start=\"766\"\u003e\n\u003cp data-end=\"1028\" data-start=\"769\"\u003e\u003cspan\u003eEasy System Integration: Dual RCA inputs and front selector let you connect a DAC, network streamer, CD player or other audio sources and switch instantly, avoiding constant cable swaps and making F2 the heart of a flexible home stereo setup.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-is-last-node=\"\" data-end=\"1272\" data-start=\"1030\"\u003e\n\u003cp data-is-last-node=\"\" data-end=\"1272\" data-start=\"1033\"\u003e\u003cspan\u003ePrecision Drive for HiFi Sound: About 9W ×2 @8Ω Class A power can drive a wide range of bookshelf and floor-standing speakers, especially passive speakers rated around 10-100W with sensitivity≥88dB. Whether used in a desktop setup or living room, it delivers immersive musicality.  \u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan\u003eQ: What tubes can be replaced on the F2?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cp data-end=\"1068\" data-start=\"1003\"\u003e\u003cspan\u003eA: The F2 supports tube rolling within compatible tube types.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp data-end=\"1281\" data-start=\"1075\"\u003e\u003cspan\u003e• Rectifier tube: 5U4G (default), compatible with 274B \/ 5Z3P \/ 5Z3PA\u003c\/span\u003e\u003cbr data-end=\"1147\" data-start=\"1144\"\u003e\u003cspan\u003e• Preamp tube: 6SN7GT (default), compatible with 6SN7 \/ CV181 \/ 6H8C \/ 6N8P\u003c\/span\u003e\u003cbr data-end=\"1227\" data-start=\"1224\"\u003e\u003cspan\u003e• Power tube: 6CA7 (default), compatible with EL34\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cspan\u003ePlease use compatible tube models and follow proper replacement procedures to ensure safe and stable operation.\u003c\/span\u003e\u003c\/div\u003e\n\u003cdiv\u003e \u003c\/div\u003e\n\u003cdiv\u003e\u003cstrong\u003e\u003cspan\u003eQ: Can I use 6-ohm speakers with the F2? Which speaker terminals should I use?\u003c\/span\u003e\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eA: Yes. 6-ohm speakers are supported. You may connect them to either the 4Ω or 8Ω speaker terminals. In most setups, we recommend using the 8Ω terminals for better dynamics and output strength, while the 4Ω terminals may provide a slightly softer and smoother sound.\u003c\/span\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003chr\u003e\n\u003cspan\u003e\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003eParameters\u003c\/span\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eBrand: Nobsound\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eModel: F2\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAudio input: 2 sets of RCA inputs\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAudio output: Banana speaker jacks\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eOutput power: 9W ×2 RMS @ 8Ω (ultralinear operation)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFrequency response: 20Hz-20KHz\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTHD: \u0026lt; 1% (at 1kHz)\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSNR: 88dB\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInput sensitivity: 500mV-2000mV\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInput impedance: 100KΩ\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCompatible speaker impedance: 4Ω-8Ω\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInput voltage: AC 110V-120V \/ 220V-240V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDimensions (W*D*H): 310*225*200mm \/ 12.20*8.85*7.87in\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNet weight: 8.60kg \/ 18.96lb\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003ePackage weight: 10.50kg \/ 23.15lb\u003c\/span\u003e\u003cspan\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv\u003e\u003chr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\u003cspan\u003ePacking List\u003c\/span\u003e\u003c\/div\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e1* F2\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e1* Power Cable\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e1* User Manual\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Douk Audio","offers":[{"title":"US","offer_id":48090621673704,"sku":"DZ112-US-1","price":349.99,"currency_code":"USD","in_stock":true},{"title":"UK","offer_id":48090621706472,"sku":"DZ112-US-2","price":349.99,"currency_code":"USD","in_stock":false},{"title":"EU","offer_id":48090621739240,"sku":"DZ112-US-3","price":349.99,"currency_code":"USD","in_stock":false},{"title":"AU","offer_id":48090621772008,"sku":"DZ112-US-4","price":349.99,"currency_code":"USD","in_stock":false},{"title":"China","offer_id":48090621804776,"sku":"DZ112-US-5","price":349.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0640\/6995\/9912\/files\/2_64f6acc1-cd04-424a-922e-5f7e369d3060.jpg?v=1767087057","url":"https:\/\/doukaudio.com\/it-ca\/products\/douk-audio-f2-single-ended-class-a-tube-amplifier-hifi-stereo-audio-integrated-tube-amp","provider":"Douk Audio","version":"1.0","type":"link"}