{"product_id":"marshall-sn20h-studio-classic-jcm900-20w-valve-amplifier-head","title":"Marshall SN20H Studio Classic JCM900 20W Valve Amplifier, Head","description":"\u003cp\u003eExperience the legendary Marshall tone in a compact format with the SN20H Studio Classic JCM900. This 20-watt valve amplifier head delivers the iconic crunch and sustain that defined generations of rock, all in a manageable size perfect for studios and smaller venues. Built on the proven JCM900 platform, it combines professional-grade circuitry with genuine tube warmth that digital modelling simply can't replicate. Whether you're tracking in the studio or gigging locally, this head offers the authentic Marshall character and reliability you've trusted for decades—now more accessible than ever.\u003c\/p\u003e\n\u003cul class=\"KsbFXc U6u95\" data-processed=\"true\"\u003e\n\u003cli data-hveid=\"CAQQAA\" data-processed=\"true\"\u003e\u003cspan class=\"T286Pc\" data-sfc-cp=\"\" data-processed=\"true\"\u003e\u003cstrong class=\"Yjhzub\" data-processed=\"true\"\u003ePower:\u003c\/strong\u003e 20 watts, switchable to 5W or less than 1W for lower volume.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-hveid=\"CAQQAQ\" data-processed=\"true\"\u003e\u003cspan class=\"T286Pc\" data-sfc-cp=\"\" data-processed=\"true\"\u003e\u003cstrong class=\"Yjhzub\" data-processed=\"true\"\u003eValves:\u003c\/strong\u003e Uses ECC83 (preamp) and 5881 (power amp) tubes.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-hveid=\"CAQQAg\" data-processed=\"true\"\u003e\u003cspan class=\"T286Pc\" data-sfc-cp=\"\" data-processed=\"true\"\u003e\u003cstrong class=\"Yjhzub\" data-processed=\"true\"\u003eChannels:\u003c\/strong\u003e Two channels (Clean\/Crunch \u0026amp; Lead) with independent volume and reverb controls.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-hveid=\"CAQQAw\" data-processed=\"true\"\u003e\u003cspan class=\"T286Pc\" data-sfc-cp=\"\" data-processed=\"true\"\u003e\u003cstrong class=\"Yjhzub\" data-processed=\"true\"\u003eEQ:\u003c\/strong\u003e Shared 4-band EQ (Bass, Middle, Treble, Presence).\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-hveid=\"CAQQBA\" data-processed=\"true\"\u003e\u003cspan class=\"T286Pc\" data-sfc-cp=\"\" data-processed=\"true\"\u003e\u003cstrong class=\"Yjhzub\" data-processed=\"true\"\u003eEffects:\u003c\/strong\u003e Built-in spring reverb and a series effects loop.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-hveid=\"CAQQBQ\" data-processed=\"true\"\u003e\u003cspan class=\"T286Pc\" data-sfc-cp=\"\" data-processed=\"true\"\u003e\u003cstrong class=\"Yjhzub\" data-processed=\"true\"\u003eOutputs:\u003c\/strong\u003e Includes speaker outputs for various impedances (4\/8\/16 Ohms) and DI\/Compensated DI outputs for recording\/live.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-hveid=\"CAQQBg\" data-processed=\"true\"\u003e\u003cspan class=\"T286Pc\" data-sfc-cp=\"\" data-processed=\"true\"\u003e\u003cstrong class=\"Yjhzub\" data-processed=\"true\"\u003eControls:\u003c\/strong\u003e Gain, Volume (Ch A\/B), Reverb (Ch A\/B), Master, Presence, Bass, Middle, Treble, Power Reduction switch, Standby, Power.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli data-hveid=\"CAQQBw\" data-processed=\"true\"\u003e\n\u003cspan class=\"T286Pc\" data-sfc-cp=\"\" data-processed=\"true\"\u003e\u003cstrong class=\"Yjhzub\" data-processed=\"true\"\u003eIncluded:\u003c\/strong\u003e Footswitch for channel changing.\u003c\/span\u003e\u003cspan class=\"uJ19be notranslate\" data-wiz-uids=\"Rjj4Uc_1u,Rjj4Uc_1v\" data-processed=\"true\"\u003e\u003cspan class=\"vKEkVd\" data-animation-atomic=\"\" data-wiz-attrbind=\"class=Rjj4Uc_1t\/TKHnVd\" data-processed=\"true\"\u003e \u003c\/span\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Marshall","offers":[{"title":"Default Title","offer_id":57152635208067,"sku":"SN20H","price":999.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0432\/6024\/8218\/files\/studio900head-front-desktop-1.png?v=1767913457","url":"https:\/\/astrings.co.uk\/products\/marshall-sn20h-studio-classic-jcm900-20w-valve-amplifier-head","provider":"A Strings","version":"1.0","type":"link"}