{"product_id":"aurorasound-hfsa-01-valve-integrated-amplifier-with-mm-phonostage","title":"Aurorasound HFSA-01 Valve Integrated Hybrid Amplifier with MM Phonostage","description":"\u003cp\u003eAurorasound HFSA-01 Hybrid Amplifier\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe HFSA-01 is a compact hybrid integrated amplifier that combines vacuum tube warmth with solid-state precision. Designed around a push-pull EL84 output stage, it delivers a balanced and engaging sound while maintaining flexibility for both analogue and digital sources.\u003c\/p\u003e\n\u003cp\u003eKey features:\u003c\/p\u003e\n\u003cp\u003e• hybrid integrated amplifier (tube + solid-state)\u003cbr\u003e• EL84 vacuum tube output stage (14W + 14W)\u003cbr\u003e• built-in MM phono stage\u003cbr\u003e• 3 x RCA line inputs\u003cbr\u003e• bass and treble tone controls\u003cbr\u003e• headphone output\u003cbr\u003e• compatible with 4Ω – 8Ω speakers\u003cbr\u003e• push-pull ultra-linear tube configuration\u003c\/p\u003e\n\u003cp\u003eDesign and performance:\u003c\/p\u003e\n\u003cp\u003eThe HFSA-01 uses EL84 output valves in a push-pull configuration, delivering low distortion and stable frequency response. This design provides a controlled, detailed sound while retaining the natural warmth associated with tube amplification.\u003c\/p\u003e\n\u003cp\u003eA Texas Instruments OPA604A op-amp is used in the driver stage, forming a precise phase inverter to optimise the performance of the output tubes. This ensures clean signal handling and efficient power delivery.\u003c\/p\u003e\n\u003cp\u003eThe integrated phono stage uses a semiconductor-based NF-type circuit, offering strong signal-to-noise performance for MM cartridges.\u003c\/p\u003e\n\u003cp\u003eMaterials and construction:\u003c\/p\u003e\n\u003cp\u003e• EL84 (6BQ5 equivalent) vacuum tubes\u003cbr\u003e• custom-designed output and power transformers (Japan)\u003cbr\u003e• Rohm silicon carbide diodes for low-noise rectification\u003cbr\u003e• high-quality capacitors and resistors throughout\u003cbr\u003e• isolated power supply sections for tube and solid-state stages\u003c\/p\u003e\n\u003cp\u003eThe power supply is fully separated between tube and semiconductor circuits, reducing interference and maintaining stability across volume levels and frequencies.\u003c\/p\u003e\n\u003cp\u003eSound characteristics:\u003c\/p\u003e\n\u003cp\u003e• warm, natural tonal balance\u003cbr\u003e• controlled and low-distortion output\u003cbr\u003e• clear midrange with smooth treble\u003cbr\u003e• flexible tonal shaping via bass and treble controls\u003cbr\u003e• stable performance across a wide range of sources\u003c\/p\u003e\n\u003cp\u003eThe tone control section uses a CR-type circuit, allowing subtle adjustment of bass and treble to suit room conditions or speaker characteristics.\u003c\/p\u003e\n\u003cp\u003eBuild and usability:\u003c\/p\u003e\n\u003cp\u003eThe HFSA-01 features a retro-inspired design with mahogany wood side panels and solid wood control knobs. The layout is straightforward, with accessible inputs and front-panel controls for easy operation.\u003c\/p\u003e\n\u003cp\u003eSpecifications:\u003c\/p\u003e\n\u003cp\u003e• power output: 14W + 14W\u003cbr\u003e• output tubes: EL84 (push-pull)\u003cbr\u003e• inputs: 3 x RCA line, 1 x MM phono\u003cbr\u003e• speaker compatibility: 4Ω – 8Ω\u003cbr\u003e• headphone output: yes\u003cbr\u003e• tone controls: bass and treble\u003c\/p\u003e\n\u003cp\u003eNote:\u003c\/p\u003e\n\u003cp\u003eThe HFSA-01 is designed as a versatile, all-in-one amplifier that balances traditional tube sound with modern usability, making it suitable for a wide range of systems and listening preferences.\u003cbr\u003e\u003c\/p\u003e","brand":"Aurorasound","offers":[{"title":"Default Title","offer_id":58297877430656,"sku":"RRS-HFS-01-VLV","price":3699.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1002\/6926\/1184\/files\/rs_w_1200_h_1200_7a3a14b8-ca02-46a4-aca1-c831b6b65a87.png?v=1781876734","url":"https:\/\/thespinningroomhifi.co.uk\/products\/aurorasound-hfsa-01-valve-integrated-amplifier-with-mm-phonostage","provider":"The Spinning Room Hifi","version":"1.0","type":"link"}