{"title":"Monoblock Amplifiers","description":"\u003csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-(--header-height)\" dir=\"auto\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pt-12 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"text-token-text-primary w-full focus:outline-none [--shadow-height:45px] has-data-writing-block:pointer-events-none has-data-writing-block:-mt-(--shadow-height) has-data-writing-block:pt-(--shadow-height) [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto [content-visibility:auto] supports-[content-visibility:auto]:[contain-intrinsic-size:auto_100lvh] R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\" dir=\"auto\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv dir=\"auto\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full wrap-break-word light markdown-new-styling\"\u003e\n\u003cp\u003eMonoblock amplifiers use a dedicated amplifier for each channel, delivering maximum channel separation, power and control for high-performance systems. By isolating left and right channels, they reduce interference and improve clarity, dynamics and soundstage precision. At Spinning Room HiFi, you’ll find a focused selection of monoblock amplifiers from AGD Productions, Bel Canto and Aurorasound, all available to hear and compare in-store.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e","products":[{"product_id":"valvet-a4e-mono-class-a-power-amplifiers","title":"Valvet A4e mono class A Power Amplifiers (pair)","description":"\u003cp data-start=\"0\" data-end=\"51\"\u003eVALVET A4e Class A Mono Power Amplifiers (Pair)\u003c\/p\u003e\n\u003cp data-start=\"53\" data-end=\"386\"\u003eThe VALVET A4e mono power amplifiers represent the pinnacle of the brand’s amplifier design—delivering exceptionaal musicality, control, and long-term reliability. Designed for pure listening pleasure, these Class A mono blocks offer a natural, effortless presentation that brings out every detail without ever overpowering the music.\u003c\/p\u003e\n\u003cp data-start=\"388\" data-end=\"703\"\u003eWith an upgraded 800W transformer, inrush current limiter, and Furutech Rhodium AC input, the A4e combines refined engineering with premium components. Operating in pure Class A push-pull mode with a single pair of output transistors, it avoids unnecessary complexity—resulting in a cleaner, more transparent sound.\u003c\/p\u003e\n\u003cp data-start=\"705\" data-end=\"958\"\u003eFast, controlled, and highly dynamic, the A4e delivers an engaging listening experience with outstanding detail and flow. Its extremely stable power supply ensures excellent current delivery, allowing it to drive even demanding speakers with confidence.\u003c\/p\u003e\n\u003cp data-start=\"960\" data-end=\"977\"\u003eKey Features:\u003c\/p\u003e\n\u003cul data-start=\"978\" data-end=\"1463\"\u003e\n\u003cli data-section-id=\"1sbkxwx\" data-start=\"978\" data-end=\"1029\"\u003ePure Class A mono power amplifier design (pair)\u003c\/li\u003e\n\u003cli data-section-id=\"1xa1axo\" data-start=\"1030\" data-end=\"1068\"\u003e65W into 8 ohms \/ 105W into 4 ohms\u003c\/li\u003e\n\u003cli data-section-id=\"lerrth\" data-start=\"1069\" data-end=\"1123\"\u003eUpgraded 800W transformer for improved performance\u003c\/li\u003e\n\u003cli data-section-id=\"1pgsip6\" data-start=\"1124\" data-end=\"1193\"\u003eSingle pair of output transistors for minimal signal interference\u003c\/li\u003e\n\u003cli data-section-id=\"1xff88h\" data-start=\"1194\" data-end=\"1253\"\u003ePush-pull Class A operation for natural, detailed sound\u003c\/li\u003e\n\u003cli data-section-id=\"oqjrz4\" data-start=\"1254\" data-end=\"1318\"\u003eExtremely stable power supply for excellent current delivery\u003c\/li\u003e\n\u003cli data-section-id=\"f8ptto\" data-start=\"1319\" data-end=\"1361\"\u003eHigh-quality Furutech Rhodium AC input\u003c\/li\u003e\n\u003cli data-section-id=\"17aotol\" data-start=\"1362\" data-end=\"1410\"\u003eInrush current limiter for system protection\u003c\/li\u003e\n\u003cli data-section-id=\"dcxsqn\" data-start=\"1411\" data-end=\"1463\"\u003eFast, controlled, and highly dynamic performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1465\" data-end=\"1481\"\u003eConnections:\u003c\/p\u003e\n\u003cul data-start=\"1482\" data-end=\"1522\"\u003e\n\u003cli data-section-id=\"wh7pzf\" data-start=\"1482\" data-end=\"1502\"\u003eLine-level input\u003c\/li\u003e\n\u003cli data-section-id=\"nuein3\" data-start=\"1503\" data-end=\"1522\"\u003eSpeaker outputs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1524\" data-end=\"1544\"\u003eWhat’s Included:\u003c\/p\u003e\n\u003cul data-start=\"1545\" data-end=\"1633\"\u003e\n\u003cli data-section-id=\"2xspmx\" data-start=\"1545\" data-end=\"1589\"\u003ePair of VALVET A4e Mono Power Amplifiers\u003c\/li\u003e\n\u003cli data-section-id=\"c52759\" data-start=\"1590\" data-end=\"1606\"\u003ePower cables\u003c\/li\u003e\n\u003cli data-section-id=\"1rj4ns0\" data-start=\"1607\" data-end=\"1633\"\u003eManufacturer packaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1635\" data-end=\"1819\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eNote: These are high-performance Class A amplifiers and will generate heat during operation. Ensure adequate ventilation and proper placement for optimal performance and longevity.\u003c\/p\u003e","brand":"Valvet","offers":[{"title":"Default Title","offer_id":58297800851840,"sku":"VLV-A4E-MN-CLS","price":10950.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1002\/6926\/1184\/files\/rs_w_1200_h_1200_3cc1c4c2-c1a7-4186-a3f9-ab093ba1654c.png?v=1781876339"},{"product_id":"valvet-a45-mono-class-a-power-amplifiers","title":"Valvet A4.5 Mono Class A Power Amplifiers (pair)","description":"\u003cp data-start=\"0\" data-end=\"52\"\u003eVALVET A4.5 Class A Mono Power Amplifiers (Pair)\u003c\/p\u003e\n\u003cp data-start=\"54\" data-end=\"378\"\u003eThe VALVET A4.5 mono power amplifiers represent the final evolution of VALVET’s amplifier design—refined over decades to deliver exceptional musicality, control, and long-term reliability. Built for those who demand both performance and longevity, these monoblocks provide a deeply engaging and natural listening experience.\u003c\/p\u003e\n\u003cp data-start=\"380\" data-end=\"636\"\u003eFast, controlled, and powerful, the A4.5 amplifiers support the flow of music without imposing their own character. The result is a dynamic, balanced, and highly musical presentation with outstanding detail, deep bass control, and a natural sense of space.\u003c\/p\u003e\n\u003cp data-start=\"638\" data-end=\"966\"\u003eOperating in pure Class A push-pull mode with a single pair of output transistors, the A4.5 maintains signal purity and avoids the compromises often associated with more complex designs. Combined with an ultra-stable power supply and precision engineering, it delivers effortless performance across a wide range of loudspeakers.\u003c\/p\u003e\n\u003cp data-start=\"968\" data-end=\"985\"\u003eKey Features:\u003c\/p\u003e\n\u003cul data-start=\"986\" data-end=\"1455\"\u003e\n\u003cli data-section-id=\"oq6fdc\" data-start=\"986\" data-end=\"1031\"\u003ePure Class A mono power amplifiers (pair)\u003c\/li\u003e\n\u003cli data-section-id=\"9b7e7w\" data-start=\"1032\" data-end=\"1070\"\u003e60W into 8 ohms \/ 100W into 4 ohms\u003c\/li\u003e\n\u003cli data-section-id=\"txpnlp\" data-start=\"1071\" data-end=\"1138\"\u003ePush-pull Class A design with single pair of output transistors\u003c\/li\u003e\n\u003cli data-section-id=\"1p8a70n\" data-start=\"1139\" data-end=\"1196\"\u003eUltra-stable power supply for strong current delivery\u003c\/li\u003e\n\u003cli data-section-id=\"1vs04tv\" data-start=\"1197\" data-end=\"1252\"\u003e500 VA toroidal transformer for low noise operation\u003c\/li\u003e\n\u003cli data-section-id=\"zjcp2y\" data-start=\"1253\" data-end=\"1301\"\u003eUltra-fast rectification with 4 x 60A diodes\u003c\/li\u003e\n\u003cli data-section-id=\"gbzbiy\" data-start=\"1302\" data-end=\"1352\"\u003eNo capacitors in the signal path (DC – 100kHz)\u003c\/li\u003e\n\u003cli data-section-id=\"psutdc\" data-start=\"1353\" data-end=\"1398\"\u003eExtremely short, pure silver signal paths\u003c\/li\u003e\n\u003cli data-section-id=\"un5enn\" data-start=\"1399\" data-end=\"1455\"\u003eDynamic, neutral, and highly musical sound signature\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1457\" data-end=\"1473\"\u003eConnections:\u003c\/p\u003e\n\u003cul data-start=\"1474\" data-end=\"1514\"\u003e\n\u003cli data-section-id=\"wh7pzf\" data-start=\"1474\" data-end=\"1494\"\u003eLine-level input\u003c\/li\u003e\n\u003cli data-section-id=\"nuein3\" data-start=\"1495\" data-end=\"1514\"\u003eSpeaker outputs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1516\" data-end=\"1536\"\u003eWhat’s Included:\u003c\/p\u003e\n\u003cul data-start=\"1537\" data-end=\"1626\"\u003e\n\u003cli data-section-id=\"1ewqiwn\" data-start=\"1537\" data-end=\"1582\"\u003ePair of VALVET A4.5 Mono Power Amplifiers\u003c\/li\u003e\n\u003cli data-section-id=\"c52759\" data-start=\"1583\" data-end=\"1599\"\u003ePower cables\u003c\/li\u003e\n\u003cli data-section-id=\"1rj4ns0\" data-start=\"1600\" data-end=\"1626\"\u003eManufacturer packaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1628\" data-end=\"1771\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eNote: These Class A amplifiers generate heat during operation. Ensure adequate ventilation and space for optimal performance and longevity.\u003c\/p\u003e","brand":"Valvet","offers":[{"title":"Default Title","offer_id":58297801113984,"sku":"VLV-A4-5-MN","price":8350.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1002\/6926\/1184\/files\/rs_w_1200_h_1200_7362b537-5296-4355-afc4-b31116e561cc.png?v=1781876340"},{"product_id":"valvet-e4","title":"Valvet E4 Power Amplifiers (pair)","description":"\u003cp data-start=\"0\" data-end=\"63\"\u003eVALVET E4 Single-Ended Class A Mono Power Amplifiers (Pair)\u003c\/p\u003e\n\u003cp data-start=\"65\" data-end=\"375\"\u003eThe VALVET E4 mono power amplifiers are designed to deliver music in its purest, most natural form. Built around a simple yet highly refined circuit, they prioritise short signal paths, premium components, and a direct connection to the music—resulting in an engaging and emotionally rich listening experience.\u003c\/p\u003e\n\u003cp data-start=\"377\" data-end=\"697\"\u003eOperating in true single-ended Class A mode with a single output transistor, the E4 achieves a level of musicality and charm rarely found in other amplifier designs. Despite their modest power rating, they perform exceptionally well with efficient loudspeakers, delivering dynamic, balanced, and highly expressive sound.\u003c\/p\u003e\n\u003cp data-start=\"699\" data-end=\"912\"\u003eCombining the tonal beauty of single-ended tube amplifiers with the control and reliability of solid-state design, the E4 offers the best of both worlds—without the drawbacks of valve wear or reduced bass control.\u003c\/p\u003e\n\u003cp data-start=\"914\" data-end=\"931\"\u003eKey Features:\u003c\/p\u003e\n\u003cul data-start=\"932\" data-end=\"1417\"\u003e\n\u003cli data-section-id=\"13d8icb\" data-start=\"932\" data-end=\"985\"\u003eSingle-ended Class A mono power amplifiers (pair)\u003c\/li\u003e\n\u003cli data-section-id=\"1uscuiy\" data-start=\"986\" data-end=\"1023\"\u003e12W into 8 ohms \/ 20W into 4 ohms\u003c\/li\u003e\n\u003cli data-section-id=\"p49ake\" data-start=\"1024\" data-end=\"1090\"\u003eSingle output transistor per channel for maximum signal purity\u003c\/li\u003e\n\u003cli data-section-id=\"puvo6f\" data-start=\"1091\" data-end=\"1153\"\u003eUltra-stable power supply with 500 VA toroidal transformer\u003c\/li\u003e\n\u003cli data-section-id=\"ls1zot\" data-start=\"1154\" data-end=\"1202\"\u003eHigh-speed rectification with 4 x 60A diodes\u003c\/li\u003e\n\u003cli data-section-id=\"eajmmu\" data-start=\"1203\" data-end=\"1246\"\u003eDiscrete Class A operational amplifiers\u003c\/li\u003e\n\u003cli data-section-id=\"1ufr4c2\" data-start=\"1247\" data-end=\"1303\"\u003eExtremely short signal paths with pure silver wiring\u003c\/li\u003e\n\u003cli data-section-id=\"kb8ohs\" data-start=\"1304\" data-end=\"1366\"\u003eTube-like musicality with improved control and reliability\u003c\/li\u003e\n\u003cli data-section-id=\"k2vga4\" data-start=\"1367\" data-end=\"1417\"\u003eDynamic, balanced, and highly expressive sound\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1419\" data-end=\"1435\"\u003eConnections:\u003c\/p\u003e\n\u003cul data-start=\"1436\" data-end=\"1476\"\u003e\n\u003cli data-section-id=\"wh7pzf\" data-start=\"1436\" data-end=\"1456\"\u003eLine-level input\u003c\/li\u003e\n\u003cli data-section-id=\"nuein3\" data-start=\"1457\" data-end=\"1476\"\u003eSpeaker outputs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1478\" data-end=\"1498\"\u003eWhat’s Included:\u003c\/p\u003e\n\u003cul data-start=\"1499\" data-end=\"1586\"\u003e\n\u003cli data-section-id=\"1oh4p9k\" data-start=\"1499\" data-end=\"1542\"\u003ePair of VALVET E4 Mono Power Amplifiers\u003c\/li\u003e\n\u003cli data-section-id=\"c52759\" data-start=\"1543\" data-end=\"1559\"\u003ePower cables\u003c\/li\u003e\n\u003cli data-section-id=\"1rj4ns0\" data-start=\"1560\" data-end=\"1586\"\u003eManufacturer packaging\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1588\" data-end=\"1766\" data-is-last-node=\"\" data-is-only-node=\"\"\u003eNote: These Class A amplifiers generate heat during operation and are best paired with efficient loudspeakers for optimal performance. Ensure adequate ventilation during use.\u003c\/p\u003e","brand":"Valvet","offers":[{"title":"Default Title","offer_id":58297801179520,"sku":"VLV-E4","price":8300.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1002\/6926\/1184\/files\/rs_w_1200_h_1200_e46f9b85-d05e-493e-beff-140a8de08bcf.png?v=1781876342"},{"product_id":"bel-canto-eone-ref-601s-mono-amplifier-single","title":"Bel Canto e.ONE Ref 601s Mono Amplifier (each)","description":"\u003cp\u003eBel Canto REF601M Monoblock Power Amplifier\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe Bel Canto REF601M is a high-performance monaural power amplifier designed to deliver substantial power with low distortion and precise control. Compact and efficient, it provides high output capability while maintaining a clean and accurate sound.\u003c\/p\u003e\n\u003cp\u003eThe REF601M delivers 300 watts into 8 ohms and up to 600 watts into 4 ohms, with a minimum load of 2 ohms. Its high damping factor of over 1000 ensures strong control over loudspeakers, while low distortion figures maintain signal accuracy.\u003c\/p\u003e\n\u003cp\u003eBuilt using advanced Class D amplification, the REF601M runs cool and efficiently, making it suitable for compact installations, enclosed spaces, or stacked system configurations.\u003c\/p\u003e\n\u003cp\u003eKey Features:\u003c\/p\u003e\n\u003cp\u003e• High-performance monoblock power amplifier\u003cbr\u003e• 300W into 8 ohms, 600W into 4 ohms\u003cbr\u003e• Minimum load capability of 2 ohms\u003cbr\u003e• High damping factor (\u0026gt;1000) for speaker control\u003cbr\u003e• Low distortion (0.003% THD at 1W \/ 1 kHz)\u003cbr\u003e• Class D amplifier design for efficiency and low heat\u003cbr\u003e• Compact e.One series chassis design\u003cbr\u003e• Suitable for hi-fi and home theatre systems\u003c\/p\u003e\n\u003cp\u003eTechnical Highlights:\u003c\/p\u003e\n\u003cp\u003e• Dynamic range: 121 dB\u003cbr\u003e• Peak current: 27 A\u003cbr\u003e• Flat frequency response (±3 dB from 0 Hz to 50 kHz)\u003cbr\u003e• Impedance Optimized Input Stage with high common mode rejection\u003cbr\u003e• Low output impedance driver stage\u003cbr\u003e• Accurate and stable performance across loads\u003c\/p\u003e\n\u003cp\u003eConnectivity:\u003c\/p\u003e\n\u003cp\u003e• 1 × RCA analogue input\u003cbr\u003e• 1 × XLR balanced input\u003cbr\u003e• WBT Nextgen 5-way binding posts for speaker connection\u003c\/p\u003e\n\u003cp\u003eSpecification:\u003c\/p\u003e\n\u003cp\u003e• Power Output:\u003cbr\u003e– 300W (8 ohms)\u003cbr\u003e– 600W (4 ohms)\u003cbr\u003e• Minimum Load: 2 ohms\u003cbr\u003e• Peak Current: 27 A\u003cbr\u003e• Dynamic Range: 121 dB\u003cbr\u003e• Distortion: 0.003% THD (1W \/ 1 kHz)\u003cbr\u003e• Frequency Response: 0 Hz – 50 kHz (±3 dB)\u003cbr\u003e• Dimensions: 88 mm (H) × 216 mm (W) × 305 mm (D)\u003c\/p\u003e\n\u003cp\u003eWhat’s Included:\u003c\/p\u003e\n\u003cp\u003e• Bel Canto REF601M Monoblock Amplifier\u003cbr\u003e• Documentation\u003c\/p\u003e\n\u003cp\u003eNote:\u003c\/p\u003e\n\u003cp\u003e£2,999.95 each or £5,750 per pair\u003c\/p\u003e\n\u003cp\u003eThis product is available for in-store demonstration. Visit the Spinning Room showroom in Leeds to experience the REF601M in person.\u003cbr\u003e\u003c\/p\u003e","brand":"Bel Canto","offers":[{"title":"Default Title","offer_id":58297869697408,"sku":"BEL-CNT-E-ONE1","price":2999.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1002\/6926\/1184\/files\/rs_w_1200_h_1200copy_cbc329e8-9587-4387-8ea3-564d07d5acaf.png?v=1781876697"},{"product_id":"aurorasound-pada-300b-mono-block-amplifiers-pair","title":"Aurorasound PADA-300B Mono Block Amplifiers (pair)","description":"\u003cp\u003eAurorasound PADA-300B Monoblock Amplifiers\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe PADA-300B is Shinobu Karaki’s latest amplifier design, a hybrid push-pull monoblock built around the iconic 300B valve. Combining transistor precision with classic tube output, it delivers 28 watts per channel with a focus on musicality, stability, and long-term reliability.\u003c\/p\u003e\n\u003cp\u003eKey features:\u003c\/p\u003e\n\u003cp\u003e• hybrid push-pull monoblock amplifier\u003cbr\u003e• 28 watts per channel output\u003cbr\u003e• 300B output valves (various options available)\u003cbr\u003e• transistor front-end with tube output stage\u003cbr\u003e• inter-stage transformer coupling\u003cbr\u003e• no negative feedback design\u003cbr\u003e• AC-driven filament supply\u003cbr\u003e• self-biasing circuit (no manual adjustment required)\u003cbr\u003e• independent power regulators (front-end and output stage)\u003cbr\u003e• silicon carbide Schottky diodes\u003cbr\u003e• polypropylene film capacitors throughout\u003cbr\u003e• vintage Japanese NEC and Toshiba transistors\u003cbr\u003e• Lundahl transformers\u003cbr\u003e• solid rosewood chassis with aluminium top plate\u003c\/p\u003e\n\u003cp\u003eDesign and performance:\u003c\/p\u003e\n\u003cp\u003eUnlike conventional hybrid amplifiers, the PADA-300B reverses the typical architecture by using transistors in the front-end and valves in the output stage. This allows the amplifier to benefit from the low distortion, high signal-to-noise ratio, and wide bandwidth of transistors, while retaining the natural tonal qualities of 300B tubes.\u003c\/p\u003e\n\u003cp\u003eAn inter-stage transformer is used to match signal levels and provide the correct drive for the output tubes, ensuring efficient operation and preserving signal integrity.\u003c\/p\u003e\n\u003cp\u003eThe amplifier operates without a negative feedback loop, relying instead on the inherent linearity of the 300B valves and high-quality transformers to achieve a natural and open sound.\u003c\/p\u003e\n\u003cp\u003eMaterials and construction:\u003c\/p\u003e\n\u003cp\u003e• vintage NEC and Toshiba transistors from the 1970–80s\u003cbr\u003e• Lundahl transformers for signal integrity\u003cbr\u003e• silicon carbide Schottky diodes for low-noise rectification\u003cbr\u003e• polypropylene film capacitors for stability and longevity\u003cbr\u003e• separate regulated power supplies for front-end and output stage\u003c\/p\u003e\n\u003cp\u003eThe use of independent power regulation ensures that demanding musical passages do not affect the stability of the input stage, maintaining control and dynamics under load.\u003c\/p\u003e\n\u003cp\u003eSound characteristics:\u003c\/p\u003e\n\u003cp\u003e• natural, open and spacious presentation\u003cbr\u003e• strong dynamic control with stable power delivery\u003cbr\u003e• low noise with high clarity\u003cbr\u003e• rich tonal character from 300B output stage\u003cbr\u003e• excellent balance between precision and warmth\u003c\/p\u003e\n\u003cp\u003eThe push-pull design allows the amplifier to deliver power with control while maintaining the tonal qualities associated with single-ended 300B designs.\u003c\/p\u003e\n\u003cp\u003eBuild and craftsmanship:\u003c\/p\u003e\n\u003cp\u003eThe chassis is constructed from 25mm thick solid oiled rosewood, handcrafted in Japan, providing both structural rigidity and resonance control. The top plate is made from 4mm thick solid aluminium, offering a non-magnetic platform for the circuitry.\u003c\/p\u003e\n\u003cp\u003eEach unit reflects Aurorasound’s approach of combining traditional materials with carefully selected components to achieve both performance and durability.\u003c\/p\u003e\n\u003cp\u003eNote:\u003c\/p\u003e\n\u003cp\u003eThe PADA-300B is supplied as a pair of monoblock amplifiers. Valve options include Takatsuki 300B or Western Electric 300B, or units can be supplied without valves depending on system requirements.\u003cbr\u003e\u003c\/p\u003e","brand":"Aurorasound","offers":[{"title":"Default Title","offer_id":58297876840832,"sku":"RRS-PD-300-MN","price":16499.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1002\/6926\/1184\/files\/pada300b-006_2048x2048_9cc07321-4d9e-4eec-aebe-12b6f43446f3.png?v=1781876729"},{"product_id":"puresound-m845-mono-set-valve-power-amplifiers-pair","title":"Puresound M845 Mono SET Tube Power Amplifiers (pair)","description":"\u003cp\u003ePuresound M845 Mono Power Amplifiers\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eThe M845 is a single-ended triode (SET) mono power amplifier built around the classic 845 valve. Operating in pure Class A, it delivers a highly expressive and dynamic sound, designed to partner medium to high efficiency loudspeakers.\u003c\/p\u003e\n\u003cp\u003eKey features:\u003c\/p\u003e\n\u003cp\u003e• single-ended triode (SET) mono power amplifier\u003cbr\u003e• 845 output valve\u003cbr\u003e• Class A operation\u003cbr\u003e• 27 watts output per channel\u003cbr\u003e• custom in-house output transformer\u003cbr\u003e• 6SN7 driver stage with interstage transformer\u003cbr\u003e• zero negative feedback design\u003cbr\u003e• direct-coupled circuit (no coupling capacitors)\u003c\/p\u003e\n\u003cp\u003eDesign and performance:\u003c\/p\u003e\n\u003cp\u003eThe M845 is built around the 845 triode, originally developed by RCA in 1931. Known for its linearity and power handling, it uses a graphite anode capable of dissipating high energy while maintaining stability across the frequency range.\u003c\/p\u003e\n\u003cp\u003eA key challenge with 845 designs is managing the high voltage and filament requirements. The M845 addresses this with a carefully engineered power supply, using a hybrid Graetz bridge for rectification and a CLC filter with a substantial smoothing choke to ensure stable current delivery.\u003c\/p\u003e\n\u003cp\u003eThe driver stage is based on a 6SN7 triode, coupled via a custom wideband interstage transformer. The circuit is fully direct-coupled, eliminating coupling capacitors and preserving signal integrity.\u003c\/p\u003e\n\u003cp\u003eMaterials and construction:\u003c\/p\u003e\n\u003cp\u003e• 845 output triode with graphite anode\u003cbr\u003e• 6SN7 driver valve\u003cbr\u003e• custom-designed output transformer\u003cbr\u003e• hybrid Graetz bridge rectification\u003cbr\u003e• CLC filtered high-voltage power supply\u003cbr\u003e• wideband interstage transformer\u003c\/p\u003e\n\u003cp\u003eThe output transformer has been extensively developed in-house, with careful selection of core materials and winding techniques to maintain bandwidth and efficiency.\u003c\/p\u003e\n\u003cp\u003eSound characteristics:\u003c\/p\u003e\n\u003cp\u003e• highly dynamic and expressive presentation\u003cbr\u003e• rich tonal colour and harmonic detail\u003cbr\u003e• strong sense of energy and immediacy\u003cbr\u003e• excellent instrument texture and realism\u003cbr\u003e• wide bandwidth with natural flow\u003c\/p\u003e\n\u003cp\u003eWith no negative feedback and a fully direct-coupled design, the M845 prioritises purity and immediacy of signal, resulting in a highly engaging listening experience.\u003c\/p\u003e\n\u003cp\u003eBuild and usability:\u003c\/p\u003e\n\u003cp\u003eEach amplifier is a dedicated monoblock, designed to work as a pair in a stereo system. Due to the nature of SET amplification, it is best matched with efficient loudspeakers to achieve optimal performance.\u003c\/p\u003e\n\u003cp\u003eSpecifications:\u003c\/p\u003e\n\u003cp\u003e• output power: 27W (Class A)\u003cbr\u003e• topology: single-ended triode (SET)\u003cbr\u003e• output valve: 845\u003cbr\u003e• driver valve: 6SN7\u003cbr\u003e• circuit: direct-coupled, no negative feedback\u003c\/p\u003e\n\u003cp\u003eBrand and design:\u003c\/p\u003e\n\u003cp\u003ePuresound is a UK-based company focused on delivering high-performance valve amplification. The M845 is designed by Guy Seargent, whose background includes work with Audio Innovations, Voyd Turntables, Heybrook, and JPW, as well as training in Japan with Audio Note \/ Kondo.\u003c\/p\u003e\n\u003cp\u003eNote:\u003c\/p\u003e\n\u003cp\u003eThe M845 operates at very high voltages and is designed for use with appropriate loudspeakers. Careful system matching is essential to achieve the best performance from this amplifier.\u003cbr\u003e\u003c\/p\u003e","brand":"Puresound","offers":[{"title":"Default Title","offer_id":58297878544768,"sku":"PRS-M84-MN-SET","price":7799.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1002\/6926\/1184\/files\/rs_w_1200_h_1200-2_d05cc25e-2ab5-4e59-af00-0d7c24b08612.png?v=1781876737"}],"url":"https:\/\/thespinningroomhifi.co.uk\/collections\/monoblock-amplifiers.oembed","provider":"The Spinning Room Hifi","version":"1.0","type":"link"}