{"title":"Level Three Kits","description":"\u003cp\u003eThese are our most advanced kits. We still think most people can complete these kits, but they probably shouldn't be your first electronics project. Voltages can be a little higher, the build might take a little longer, and you may have more challenging construction - like building two of the Paradyne.\u003c\/p\u003e","products":[{"product_id":"crackatwoa-headphone-amplifier","title":"Crackatwoa Headphone Amplifier Kit","description":"\u003cp\u003e\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003eCrackatwoa is a premium version of the direct coupled Crack circuit - it \u003c\/span\u003etakes everything you love about the original Crack and dials it up. With an upgraded power supply and the Speedball constant current source built in, it delivers greater dynamic impact, tighter bass, and improved resolution—while maintaining the OTL magic that made the original a classic. Perfect for high-impedance headphones (200 ohms or higher - think \u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003eSennheiser HD600\/650\/800, Beyerdynamic 250 and 600 ohms headphones, etc.)\u003c\/span\u003e and experienced builders seeking even more from their tube amp.\u003cspan style=\"font-family: -apple-system, BlinkMacSystemFont, 'San Francisco', 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif; font-size: 0.875rem;\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eBuilders beware: This kit is more difficult than the Crack. We're calling it a Level Three kit, which means that we encourage you to get a couple successful builds under your belt before taking this one on. It's worth it, though!\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cem\u003eWe're now including the square version of our badge in each amplifier and preamplifier kit. If you prefer the word mark version, please note that in your order.\u003c\/em\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Bottlehead","offers":[{"title":"Default Title","offer_id":52093288415601,"sku":"HPK-CRACKATWOA","price":965.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/6408\/6641\/files\/crackatwoa-headphone-amplifier-kit-5644141.jpg?v=1754731609"},{"product_id":"eros-2-phono-preamplifier-kit","title":"Bottlehead Eros 2 Phono Preamplifier Kit","description":"\u003cp class=\"p1\"\u003e\u003cstrong\u003eWe are waiting for power transformers. We anticipate having the Erod 2 in stock again in late August or early September.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe Bottlehead Eros 2 is a high-performance tube phono preamp built for moving magnet and high-output moving coil cartridges. With its all-tube gain stages and accurate passive RIAA equalization, it extracts warmth, texture, and energy from your vinyl collection. Designed for serious analog enthusiasts, Eros 2 offers a dramatic sonic upgrade over entry-level phono stages, especially when paired with Bottlehead’s line and power amps.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe Eros 2 has a universal power transformer and can be used worldwide by following the wiring instructions in the manual. Please note that \u003cstrong\u003einternational customers will need to provide their own power cord.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cem\u003eWe're now including the square version of our badge in each amplifier and preamplifier kit. If you prefer the word mark version, please note that in your order.\u003c\/em\u003e\u003c\/p\u003e","brand":"Bottlehead","offers":[{"title":"Default Title","offer_id":52102752239985,"sku":"PHONOK-EROS-2","price":835.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/6408\/6641\/files\/eros-2-phono-preamplifier-kit-9366312.jpg?v=1752975573"},{"product_id":"mainline-1-1-headphone-amplifier-kit","title":"Bottlehead Mainline 1.1 Headphone Amplifier Kit","description":"\u003cp class=\"p1\"\u003e\u003cstrong\u003eWe are waiting for power transformers. We anticipate having the Mainline in stock again in late August or early September. \u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eMainline is Bottlehead’s flagship headphone amplifier, designed for the discerning audiophile. This fully balanced, single-ended amp delivers low noise, stunning resolution, and wide dynamic range—making it an ideal match for top-tier headphones like the Sennheiser HD800, Focal Utopia, and ZMF line. With a versatile circuit and precision stepped attenuator, the Mainline is a statement piece both in design and sound.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eThe Mainline has a universal power transformer and can be used worldwide by following the wiring instructions in the manual. Please note that \u003cstrong\u003einternational customers will need to provide their own power cord.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cem\u003eWe're now including the square version of our badge in each amplifier and preamplifier kit. If you prefer the word mark version, please note that in your order.\u003c\/em\u003e\u003c\/p\u003e","brand":"Bottlehead","offers":[{"title":"Default Title","offer_id":52109623918961,"sku":"HPK-MAINLINE-1-1","price":1435.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/6408\/6641\/files\/mainline-11-headphone-amplifier-kit-5576652.jpg?v=1752975574"},{"product_id":"bottlehead-paradyne-805a-monoblock-amplifier-kit","title":"Bottlehead Paradyne 805A Monoblock Amplifier Kit","description":"\u003ch4 class=\"p1\"\u003e\n\u003cb\u003eThirty-five watts of single-ended authority. Our finest design yet.\u003c\/b\u003e\u003cb\u003e\u003c\/b\u003e\n\u003c\/h4\u003e\n\u003cp class=\"p3\"\u003eFifteen years of development have gone into this design, and you can tell.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003eBuilt around the legendary \u003c\/span\u003e\u003cstrong\u003e805A\u003c\/strong\u003e transmitting tube\u003cspan class=\"s2\"\u003e, Paradyne is the most powerful amplifier kit we have ever offered. At \u003c\/span\u003e\u003cb\u003e35 watts per channel\u003c\/b\u003e\u003cspan class=\"s2\"\u003e, delivered through a \u003c\/span\u003etrue single-ended monoblock topology\u003cspan class=\"s2\"\u003e, it produces \u003c\/span\u003e\u003cb\u003etwice the power of a Kaiju run as monoblocks, \u003c\/b\u003e\u003cspan class=\"s2\"\u003eand almost \u003c\/span\u003e\u003cb\u003efour times the output of a single Kaiju amplifier\u003c\/b\u003e\u003cspan class=\"s2\"\u003e.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThis is a big step forward for our kits.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eSingle-ended amplifiers are prized for immediacy, tone density, and realism but they are rarely associated with real power. Paradyne was created to challenge that assumption.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eParadyne was designed by the holy trinity of legendary audio gurus Paul Birkeland, Paul Joppa, and Dan Schmalle. By combining the brute force of the 805A with a carefully considered driver and output stage using \u003cspan class=\"s1\"\u003e\u003cb\u003e7L7 and 6BL7 tubes\u003c\/b\u003e\u003c\/span\u003e, Paradyne delivers headroom, control, and scale that redefine what a single-ended amplifier can do with a wide range of loudspeakers. The result is an amplifier that retains the harmonic richness Bottlehead is known for while driving speakers that would have been unthinkable with earlier designs.\u003c\/p\u003e\n\u003ch4\u003e\u003cstrong\u003eIron Maidens\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eParadyne includes all-new, Bottlehead-designed iron. That means you're getting a cutting edge power transformer, our beefiest output transformer, and a new and improved plate choke. This new suite of iron provides performance gains over previous designs, and allows for switching output impedances by moving one ring terminal instead of re-wiring the secondary.\u003c\/p\u003e\n\u003ch4\u003e\u003cb\u003ePurpose-Built Monoblocks\u003c\/b\u003e\u003c\/h4\u003e\n\u003cp class=\"p3\"\u003eEach Paradyne kit includes \u003cspan class=\"s2\"\u003e\u003cb\u003ea pair of monoblocks\u003c\/b\u003e\u003c\/span\u003e, because this amplifier was never meant to be compromised by a shared power supply or layout constraints. Separating the layout into two chassis allowed us to provide:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli class=\"p1\"\u003eDedicated power and output stages per channel\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eShorter signal paths\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eGreater channel separation\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eAbsolute focus on performance\u003c\/li\u003e\n\u003cli class=\"p1\"\u003eEasier user serviceability\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"p3\"\u003eThis is power done properly.\u003cb\u003e\u003c\/b\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003eThese amps ship in two separate, well packed, insured boxes to ensure we can protect the components (and because they're heavy). Once shipped you'll get separate tracking codes for each box.\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cem\u003eT\u003c\/em\u003e\u003cem\u003ehis product has a universal power transformer and can be used worldwide.  Please note that \u003cstrong\u003einternational customers will need to provide their own power cord.\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"p3\"\u003e\u003cem\u003eWe're now including the square version of our badge in each amplifier and preamplifier kit. If you prefer the word mark version, please note that in your order.\u003c\/em\u003e\u003c\/p\u003e","brand":"Bottlehead","offers":[{"title":"Default Title","offer_id":63388612395377,"sku":"AMPK-PARADYNE-SQUARE","price":5499.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/6408\/6641\/files\/Bottlehead_Paradyne_Hero.jpg?v=1775339814"},{"product_id":"the-b-team","title":"The Bottlehead B-Team 300B System","description":"\u003cp\u003eThe \u003ca href=\"https:\/\/bottlehead.com\/products\/the-bottlehead-reference-system\" title=\"Bottlehead Reference System\"\u003eReference System\u003c\/a\u003e gets all the glory, what with those big ol' 805As staring you in the face. And you can't help to love the plucky \u003ca href=\"https:\/\/bottlehead.com\/products\/sex-4-moreplay-bundle\" title=\"Bottlehead SEX 4 and Moreplay Pairing\"\u003eMoreplay \u0026amp; SEX 4\u003c\/a\u003e pairing.\u003c\/p\u003e\n\u003cp\u003eBut what about the B-Team? Y'know... Bottlehead's legendary 300B lineup including the \u003ca href=\"https:\/\/bottlehead.com\/products\/beepre2-300b-preamplifier-kit\" title=\"Bottlehead BeePre2 300B Preamplifier Kit\"\u003eBeePre2 300B Preamplifier\u003c\/a\u003e and the \u003ca href=\"https:\/\/bottlehead.com\/products\/kaiju-300b-amplifier-kit\" title=\"Bottlehead Kaiju 300B Amplifier Kit\"\u003eKaiju 300B Amplifier kits\u003c\/a\u003e. Well, we think they're just swell.\u003c\/p\u003e\n\u003cp\u003eWhen you order the B-Team System, you'll get a BeePre2, a Kaiju, and two badges. Don't forget to add on their mods!\u003c\/p\u003e\n\u003cp\u003eAmplifiers in the B-Team System have universal power transformers and can be used worldwide by following the wiring instructions in the manuals. Please note that \u003cstrong\u003einternational customers will need to provide their own power cords.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Bottlehead","offers":[{"title":"Default Title","offer_id":64414475846001,"sku":null,"price":3240.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/6408\/6641\/files\/kaiju-300b-amplifier-kit-8026421.jpg?v=1752975579"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/6408\/6641\/collections\/bottlehead-paradyne-805a-monoblock-amplifier-kit-1589065.jpg?v=1786766169","url":"https:\/\/bottlehead.com\/collections\/level-three-kits.oembed","provider":"Bottlehead","version":"1.0","type":"link"}