{"product_id":"a60-current-feedback-amplifier-board-kit-8-pair-parallel-design-dual-channel-hi-fi-inspired-by-accuphase-a60","title":"A60+ Current-Feedback Amplifier Board Kit | 8-Pair Parallel Design, Dual-Channel Hi-Fi | Inspired by Accuphase A60","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/image-12-3-1018x1536.jpg_20260331152543.jpg?v=1774942638\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe A60+ board is an improved version based on the previously successful A60 design. Key enhancements include an increased number of output transistors (supporting up to 16 pairs \/ 32 pieces per channel), providing greater driving capability and the option to be adjusted to operate in Class A mode. Furthermore, the rectification section has been upgraded with a 120A low-resistance, high-speed rectifier, resulting in superior dynamic response.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe Accuphase A60 was a flagship amplifier of its generation, offering excellent density in both high and low frequencies, superb control, and outstanding detail and layering. Its circuit features a fully symmetrical architecture with current-feedback. A key characteristic of this design is the use of complementary push-pull circuitry from the input stage all the way to the output stage, enabling an exceptionally high slew rate of hundreds of volts per microsecond. This results in excellent drive capability for capacitive loads and overall sound quality that surpasses the earlier A2 model.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eMaterial Selection Guide\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003eDifferent transistor pairings yield distinct tonal characteristics. Please note that this is a \u003cstrong\u003epure power amplifier (main amplifier)\u003c\/strong\u003e. Some customers have attempted to compare its bass performance with that of 2.1-channel speaker systems. For dedicated bass, purchasing a subwoofer would be a more suitable choice.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003ePaired with Toshiba 2SC5200\/A1943:\u003c\/strong\u003e Delivers a \u003cstrong\u003etube-like (valve) sound character\u003c\/strong\u003e, offering \u003cstrong\u003erefined detail\u003c\/strong\u003e and a \u003cstrong\u003efull, rich tonal quality\u003c\/strong\u003e with a \u003cstrong\u003eslightly warmer, mellower tilt\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003ePaired with ON Semiconductor Series High-Power Transistors:\u003c\/strong\u003e Produces a \u003cstrong\u003elively, articulate sound\u003c\/strong\u003e with \u003cstrong\u003eexcellent layering and harmonic overtones\u003c\/strong\u003e, and \u003cstrong\u003estrong rhythmic drive\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003ePaired with Japanese Sanken High-Power Transistors:\u003c\/strong\u003e Provides \u003cstrong\u003edeep bass extension\u003c\/strong\u003e, \u003cstrong\u003epowerful dynamics\u003c\/strong\u003e, and \u003cstrong\u003etight, solid, and forceful low frequencies\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cimg alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/16_O1CN01Mf9jIy1OQC1rllJul_88221699-1024x824.jpg_20260331152544.jpg?v=1774942681\"\u003eIn addition, a specially custom-made \u003cstrong\u003e500W toroidal transformer with independent power supply for each channel\u003c\/strong\u003e is available.\u003c\/p\u003e\n\u003cp\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/19_O1CN01um9Ly11OQC1rlleiD_88221699-1024x867.jpg_20260331152554.jpg?v=1774942681\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBased on personal comparison, thanks to the excellent circuit architecture, the use of Hi-Fi grade transistors (2SC2240, 2SA970, 2SA2705, 2SA114 complementary pairs), ON Semiconductor’s 15032\/15033 for the output stage, and circuit parameters refined through countless adjustments, this amplifier delivers superior sound quality. It outperforms amplifiers like the KSA50 and various Goldmund-inspired clones in every aspect: bass performance, the sweetness of vocals, and the transparency of the highs.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003eThe board features a built-in rectifier circuit, so you only need to connect a transformer; no external rectifier board is necessary. Wiring and installation are very straightforward. The fully symmetrical architecture, combined with precisely matched transistors, ensures the midpoint voltage is extremely stable without the need for adjustment.\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003eTo set the quiescent current per output transistor to 50-100mA, adjust the board’s single TEST point until the voltage drop across its two terminals measures 20-30 mV.\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eImportant Note:\u003c\/strong\u003e Remember to use mica insulation sheets when mounting the output transistors, and ensure the mica sheets are fully coated with thermal paste.\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAC 24V x 2 ~ AC 42V x 2 \u003cstrong\u003e+\u003c\/strong\u003e AC 12V \u003cem\u003e(Note: The AC12V is for the protection circuit)\u003c\/em\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOutput Power\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e200W @ 8Ω | 400W @ 4Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTHD\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.002%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eS\/N Ratio\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026gt;100 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFrequency Response\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 Hz – 40 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePCB Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e273 mm x 88 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBoard Net Weight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eApprox. 588 g\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHeatsink Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e348 mm x 148 mm x 50 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLarge Cap. Mounting Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e25-30 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDefault Resistors\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePhilips brand resistors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e \u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/33_O1CN01xwqadm1OQBtNUBNTs_88221699.jpg_20260331152559.jpg?v=1774942794\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/image-13-3.jpg_20260331152559.jpg?v=1774942794\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/image-14-1.jpg_20260331152609.jpg?v=1774942794\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/36_O1CN01w6Ecne1OQBfJ7oTdb_88221699.jpg_20260331152631.jpg?v=1774942793\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/44_O1CN01h2JKTG1OQBvWsYQLk_88221699.jpg_20260331152608.jpg?v=1774942452\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/43_O1CN01HULz5h1OQBvWsaybg_88221699.jpg_20260331152614.jpg?v=1774942437\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/3_O1CN01gU2vDc1OQBvYdWNU2_88221699-600x600.jpg_20260331152623.jpg?v=1774942422\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/39_O1CN01KbXvxn1OQC1qnmZaF_88221699-1024x778.jpg_20260331152617.jpg?v=1774942793\" alt=\"\"\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e\u003cstrong\u003eGenuine Philips (PHILIPS) MRS25 1% Metal Film Resistors.\u003c\/strong\u003e\u003cspan\u003e High-stability metal film resistors featuring low current noise level, low temperature coefficient, and low tolerance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ds-markdown-paragraph\"\u003e \u003c\/p\u003e","brand":"GoMakerHive: Ignite Your Spark into a Blaze.","offers":[{"title":"Dual-Channel Kit (2SC2240 Version)","offer_id":51237956124976,"sku":null,"price":99.99,"currency_code":"USD","in_stock":true},{"title":"Finished Board (without output transistors \u0026 main filter capacitors) - 2SC2240 Version","offer_id":51237956157744,"sku":null,"price":119.99,"currency_code":"USD","in_stock":true},{"title":"Finished Board with Toshiba 5200 Pair \u0026 ELNA Capacitors (2240 Version)","offer_id":51237956190512,"sku":null,"price":329.99,"currency_code":"USD","in_stock":true},{"title":"A60 Matching Heatsinks (Two Pieces Dark Gray)","offer_id":51237956223280,"sku":null,"price":129.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0972\/2367\/2112\/files\/image-11-4.jpg_20260331152547.jpg?v=1774943053","url":"https:\/\/gomakerhive.com\/products\/a60-current-feedback-amplifier-board-kit-8-pair-parallel-design-dual-channel-hi-fi-inspired-by-accuphase-a60","provider":"GoMakerHive: Ignite Your Spark into a Blaze.","version":"1.0","type":"link"}