{"title":"Level Two Kits","description":"\u003cp\u003eThis kits are slightly more complicated than Level One kits. They may take longer to build, include more printed circuit board soldering (no surface mount, all through-hole), or have some cramped quarters.\u003c\/p\u003e","products":[{"product_id":"kaiju-300b-amplifier-kit","title":"Bottlehead Kaiju 300B Amplifier Kit","description":"\u003cp class=\"p1\"\u003eKaiju is our premium 300B power amplifier designed for those who want both finesse \u003cem\u003eand\u003c\/em\u003e muscle. Delivering 8 watts per channel with classic triode richness and outstanding clarity, it’s a powerful partner for high-efficiency speakers. Whether you’re driving full-range drivers or classic horns, Kaiju’s spacious soundstage and articulate dynamics bring music to life with authority. Kaijus can also be wired as monoblocks to double their power output - just buy a second kit and we'll help you configure your build to accommodate.\u003cbr\u003e\u003cbr\u003eYou can learn more about the DC Filament Supply upgrade for this kit, which lowers the (already low) level of noise in super efficient speakers at \u003ca href=\"https:\/\/bottlehead.com\/product\/dc-filament-supply-for-kaiju-300b-amplifier\/\" rel=\"noopener noreferrer\" target=\"_blank\"\u003ethis \u003c\/a\u003e\u003ca title=\"DC Filament Supply for Kaiju 300B Amplifier\" href=\"..\/..\/..\/..\/..\/products\/dc-filament-supply-for-kaiju-300b-amplifier\/\" rel=\"noopener noreferrer\" target=\"_blank\"\u003elink\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp class=\"p1\"\u003eWe consider the Kaiju to be a level three kit, which means that we still think anyone can build it, but less experienced builders might want to cut their teeth on a couple smaller soldering projects first.\u003cbr\u003e\u003cbr\u003eThe Kaiju has a universal power transformer and can be used worldwide by following the wiring instructions in the manual. Please note that \u003cstrong\u003eI\u003c\/strong\u003e\u003cstrong\u003enternational 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":52102751879537,"sku":"AMPK-KAIJU","price":2145.0,"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"},{"product_id":"stereomour-ii-stereo-single-ended-integrated-2a3-amp","title":"Bottlehead Stereomour II Stereo Single Ended Integrated 2A3 Amp","description":"\u003cp class=\"p1\"\u003eThe Bottlehead Stereomour II is a single-ended 2A3 stereo amplifier delivering 3.5 watts per channel of pure triode magic. With its natural tone and vivid midrange, it’s the ideal match for high-efficiency speakers in nearfield, desktop, or intimate room setups. Built-in volume control and input switching let it operate as an integrated amp.\u003c\/p\u003e\n\u003cp\u003eThe Stereomour II has three incredible upgrades that make it a tinkerer's dream. Lower the already-low noise floor with the \u003ca title=\"DC Filament Supply Upgrade for Stereomour II\" href=\"..\/..\/..\/..\/..\/products\/dc-filament-supply-for-stereomour-ii-amplifier\" rel=\"noopener\" target=\"_blank\"\u003eDC Filament Supply Upgrade\u003c\/a\u003e, add a premium coarse and fine stepped volume controls with the \u003ca title=\"MourQuiet Stepped Attenuator Upgrade for Stereomour II\" href=\"..\/..\/..\/..\/..\/products\/mourquiet-stepped-attenuator-upgrade-for-stereomour-ii\" rel=\"noopener\" target=\"_blank\"\u003eMourQuiet Attenuator\u003c\/a\u003e, and expand dynamic performance with the \u003ca title=\"Shunt Regulator Upgrade for Stereomour II\" href=\"..\/..\/..\/..\/..\/products\/stereomour-ii-shunt-regulator-upgrade-kit\" rel=\"noopener\" target=\"_blank\"\u003eShunt Regulator Upgrade\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eWe have a vibrant community on \u003ca title=\"Bottlehead Forums\" href=\"https:\/\/forums.bottlehead.com\" rel=\"noopener\" target=\"_blank\"\u003eour forums\u003c\/a\u003e. Check out user impressions, get inspiration for your build, and chat with us if you need help getting your kit assembled.\u003c\/p\u003e\n\u003cp\u003eThe Steremour II 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\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":52102751912305,"sku":"AMPK-STEREOMOUR-II","price":1485.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/6408\/6641\/files\/stereomour-ii-stereo-single-ended-integrated-2a3-amp-8218449.jpg?v=1752975579"},{"product_id":"beepre2-300b-preamplifier-kit","title":"Bottlehead BeePre2 300B Preamplifier Kit","description":"\u003cp class=\"p1\"\u003eThe Bottlehead BeePre2 is a 300B-based vacuum tube preamplifier that redefines what a line stage can be. Using directly heated triodes for voltage gain, it delivers breathtaking transparency, texture, and drive. The BeePre2 is a no-compromise centerpiece for serious tube systems—especially when paired with Bottlehead \u003ca title=\"Bottlehead Eros 2 Phono Preamplifier Kit\" href=\"..\/..\/..\/..\/..\/products\/eros-2-phono-preamplifier-kit\" rel=\"noopener\" target=\"_blank\"\u003ephono preamps\u003c\/a\u003e and \u003ca title=\"Bottleheaed Kaiju 300B Amplifier Kit\" href=\"..\/..\/..\/..\/..\/products\/kaiju-300b-amplifier-kit\" rel=\"noopener\" target=\"_blank\"\u003epower amps\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eWe offer two upgrade options to make the BeePre2 even more versatile. The \u003ca title=\"Bee2Quiet Stepped Attenuator\/Constant Current Source Upgrade for BeePre2\" href=\"https:\/\/bottlehead.com\/products\/bee2quiet-upgrade-for-beepre2\" rel=\"noopener\" target=\"_blank\"\u003eBee2Quiet\u003c\/a\u003e replaces the stock volume control on your BeePre2 with a stepped attenuator featuring stereo coarse and fine controls with thirty-six 1.5dB steps for a total of -52.5dB attenuation. Add the \u003ca title=\"Hybrid Shunt Regulator and Low Impedance Balanced Output upgrade kit\" href=\"https:\/\/bottlehead.com\/products\/beepre2-output-upgrade-hybrid-shunt-regulator-and-low-impedance-balanced-output\" rel=\"noopener\" target=\"_blank\"\u003eHybrid Shunt Regulator and Low Impedance Balanced Output upgrade kit\u003c\/a\u003e to lower output impedance substantially to about 400 ohms from the unbalanced output, and allow for the addition of balanced XLR outputs.\u003c\/p\u003e\n\u003cp\u003eIt typically takes anywhere from a day to a couple of weeks to get your kit ready to ship.\u003cbr\u003e\u003cbr\u003eThe Bottlehead BeePre2 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\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":52102752076145,"sku":"PREK-BEEPRE-2","price":1535.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/6408\/6641\/files\/Bottlehead_BeePre2_Lifestyle.jpg?v=1775341484"},{"product_id":"sex-4-kit-for-headphones-speakers","title":"Bottlehead SEX 4 Kit for Headphones \u0026 Speakers","description":"\u003cp\u003eSay hello to the new Single Ended eXperimentation (SEX) kit!\u003c\/p\u003e\n\u003cp\u003eThe SEX 4 has a ton of changes under the hood. For starters, it uses two 6FM7 tubes and a refined circuit to drive more than double the power of the SEX 3. We’ve heard from builders that they’re increasingly using preamps and digital sources, so we’ve removed the volume control. This plus the roomier chassis provides ample opportunity for experimentation.\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eSpeaking of experimentation, we’ve added a useful experiment to the stock kit. Sitting front and center is a new switch. Flipping it \u003c\/span\u003e\u003cspan\u003econtrols the\u003c\/span\u003e\u003cspan\u003e amount of local, plate-to-plate feedback \u003c\/span\u003e\u003cspan\u003eapplied\u003c\/span\u003e\u003cspan\u003e in the \u003c\/span\u003e\u003cspan\u003ecircuit\u003c\/span\u003e\u003cspan\u003e. What does that mean? The higher feedback allows the SEX to act as a low-gain power amplifier with \u003c\/span\u003e\u003cspan\u003etighter\u003c\/span\u003e\u003cspan\u003e mid- and low-end performance and a blacker background. Switching to lower feedback mode gets you performance closer to a traditional desktop tube headphone amp. You should see more warmth, emotion, and character.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eIn either feedback mode, the SEX 4 feels a lot more controlled than the SEX 3 in the bass department, and the lower gain option mates solidly to a Moreplay and avoids hair trigger volume control issues. We’ve built a bundle so you can buy both the SEX 4 and the Moreplay at a discount.\u003c\/p\u003e\n\u003cp\u003eSEX 4 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\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":55747018359153,"sku":"COMBOK-SEX-4-0","price":885.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/6408\/6641\/files\/more-sex-combo-5145595.png?v=1757954364"},{"product_id":"sex-4-moreplay-bundle","title":"More SEX Combo","description":"\u003cp\u003eWe built the SEX 4 to be the perfect companion to our popular Moreplay preamplifier. We're offering the two as a bundle at a discount. After all, everyone could use More SEX. In this kit you'll get:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca rel=\"noopener noreferrer\" title=\"Bottlehead SEX 4 Kit\" href=\"https:\/\/bottlehead.com\/products\/single-ended-experimenters-kit-4-0-for-headphones-sensitive-speakers\" target=\"_blank\"\u003eThe all-new SEX 4 amplifier kit\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003ca rel=\"noopener noreferrer\" title=\"Bottlehead Moreplay Preamplifier Kit\" href=\"https:\/\/bottlehead.com\/products\/moreplay-preamplifier-kit\" target=\"_blank\"\u003eOur best-selling Moreplay preamplifier kit\u003c\/a\u003e\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eGet 10% off the \u003ca rel=\"noopener noreferrer\" title=\"Moreplay Upgrade Kit\" href=\"https:\/\/bottlehead.com\/products\/moreplay-upgrade-kit\" target=\"_blank\"\u003eMoreplay Upgrade\u003c\/a\u003e and \u003ca rel=\"noopener noreferrer\" title=\"Bottlehead Power Cord Kit\" href=\"https:\/\/bottlehead.com\/products\/bottlehead-power-cord-kit\" target=\"_blank\"\u003ePower Cord kit\u003c\/a\u003e if you buy them with the combo! \u003c\/p\u003e\n\u003cp\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":62394534494577,"sku":"BUNDLE-MORESEX","price":1219.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/6408\/6641\/files\/more-sex-combo-8153832.png?v=1759027208"},{"product_id":"the-bottlehead-reference-system","title":"The Bottlehead Reference System","description":"\u003cp\u003eBeePre2 and Paradyne were designed with the same goals in mind: high headroom, low noise, and a direct, unforced presentation. Together, they deliver power and warmth without effort. With a conservatively rated 35 watts per channel, Paradyne brings nearly three times the output of our next most powerful amp, and BeePre2 is built to drive it properly.BeePre2’s low output impedance and ample voltage swing give Paradyne exactly what it wants at the input, with control and clarity intact. The result is a signal chain that stays stable from source to speaker, preserving dynamics, tone, and space without strain. No workarounds or mismatches. Just a front end and power stage operating as a system. Grab the combo for a 15% discount. \u003c\/p\u003e\n\u003cp\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\n\u003cp\u003e\u003cstrong\u003eNote: volume discounts do not apply to packages like the Reference System or MoreSex Combo.\u003c\/strong\u003e\u003c\/p\u003e","brand":"Bottlehead","offers":[{"title":"Default Title","offer_id":63353707495793,"sku":null,"price":5970.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/6408\/6641\/files\/Bottlehead_Reference_System.jpg?v=1775339867"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/6408\/6641\/collections\/SEX4Transparent.png?v=1786765963","url":"https:\/\/bottlehead.com\/collections\/level-two-kits.oembed","provider":"Bottlehead","version":"1.0","type":"link"}