{"product_id":"bravo","title":"Bravo - 6v6 tube Headphone Amplifier","description":"\u003cp style=\"line-height: 1.7; margin-bottom: 1em;\"\u003eHand Built in North Carolina, USA\u003c\/p\u003e\n\u003cul style=\"line-height: 1.7; margin-bottom: 1.5em; padding-left: 1.5em;\"\u003e\n\u003cli\u003ePure Class-A Operation\u003c\/li\u003e\n\u003cli\u003eDual Independent Power Supplies\u003c\/li\u003e\n\u003cli\u003eTwo 6SN7 (NOS) and two pairs of 6V6 (NOS) included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 1.5em;\"\u003eDesigned and tuned for the discerning listener.\u003cbr\u003e\u003cstrong style=\"color: #990bfe;\"\u003eA Lifetime Amp\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 1.5em; text-align: center;\"\u003e\u003cimg style=\"max-width: 100%; height: auto;\" alt=\"Bravo amplifier acoustic performance chart plotting dB SPL output against headphone impedance from 16 Ω to 600 Ω across three efficiency tiers (85, 95, and 100 dB\/mW), with sample headphones — ULI, Ada, O2, Utopia, and HD600 — all reaching above 110 dB SPL of clean headroom.\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0719\/5705\/3736\/files\/Bravo-Acoustic-Performance-Chart_898738a1-303b-400c-b6b2-d5fecfbde984.png?v=1779486549\"\u003e\u003c\/p\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 2em; text-align: center;\"\u003e\u003cimg style=\"max-width: 100%; height: auto;\" alt=\"Bravo amplifier headphone output power matrix — dual-axis chart plotting clean output power in milliwatts (purple, left axis) and max clean voltage in V RMS (yellow dashed, right axis) against headphone impedance from 8 Ω to 600 Ω. Power peaks at 500 mW into 32 Ω and descends to 81 mW at 600 Ω; voltage rises monotonically from 1.6 V at 8 Ω to 7.0 V at 600 Ω. Tested at the manufacturer's bench with clean sine wave, pre-clipping.\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0719\/5705\/3736\/files\/Bravo-Power-Output-Chart_a293a8ec-788f-467b-9db4-6036708ee31b.png?v=1779572330\"\u003e\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 0.5em;\"\u003e\u003cstrong\u003eCore Architecture\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"line-height: 1.7; margin-bottom: 1.5em; padding-left: 1.5em;\"\u003e\n\u003cli\u003ePure Class-A Operation\u003c\/li\u003e\n\u003cli\u003eTube Complement: 6SN7 \u0026amp; 6V6\u003c\/li\u003e\n\u003cli\u003eDual Independent Power Supplies\u003c\/li\u003e\n\u003cli\u003ePure Single-Ended Triode-to-Pentode Signal Path\u003c\/li\u003e\n\u003cli\u003eNo-Compromise Topology \u003cem\u003e(Zero tone-killing compromises; entirely free of Cathode Follower or Parafeed circuits)\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003eTrue Auto-Bias Circuitry\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized Load Profile:\u003c\/strong\u003e Ideal for headphones 32 Ω to 600 Ω\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 0.5em;\"\u003e\u003cstrong\u003eCraftsmanship \u0026amp; Signal Path\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"line-height: 1.7; margin-bottom: 1.5em; padding-left: 1.5em;\"\u003e\n\u003cli\u003e100% Hand-Built Construction\u003c\/li\u003e\n\u003cli\u003ePremium Point-to-Point Wiring\u003c\/li\u003e\n\u003cli\u003eFully Shielded Input Stage\u003c\/li\u003e\n\u003cli\u003eTKD 2CP-2511 100k Premium Volume Control\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 0.5em;\"\u003e\u003cstrong\u003ePower \u0026amp; Real-World Noise Specifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"line-height: 1.7; margin-bottom: 2em; padding-left: 1.5em;\"\u003e\n\u003cli\u003eHeavy-Duty Power Transformers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium CLCLC Filter Stage\u003c\/strong\u003e with Dual Heavy-Duty Filter Chokes\u003c\/li\u003e\n\u003cli\u003eNon-Magnetic Aluminum Chassis \u003cem\u003e(Eliminates stray eddy currents \u0026amp; hum)\u003c\/em\u003e\n\u003c\/li\u003e\n\u003cli\u003eElevated DC Filament Supply\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHonest Residual Noise Floor:\u003c\/strong\u003e −80 dB (Loaded @ 32 Ω) \/ −72 dB (Unloaded)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 1.2em;\"\u003eElevated DC filaments and a CLCLC-filtered B+ rail drop the noise floor. The result is full clean power across the entire impedance range.\u003c\/p\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 1.2em;\"\u003eThe power supply is true dual mono, meaning that each separate power supply powers one 6V6 and one side of the 6SN7 for complete channel separation.\u003c\/p\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 1.2em;\"\u003eThe B+ (high voltage) supply is rectified with ultra-fast diodes and the plates of the 6SN7 are supplied with regulated B+ from a Zener diode chain. Non-inductive Vishay resistors on the regulated B+ rail and on the 6V6 cathodes keep the signal path clean from supply to output stage.\u003c\/p\u003e\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 0.5em;\"\u003e\u003cstrong\u003eHeadphone Output Power Matrix\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable style=\"border-collapse: collapse; width: 100%; margin-bottom: 1.5em;\" cellspacing=\"0\" cellpadding=\"8\" border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 10px 12px;\"\u003eImpedance\u003c\/th\u003e\n\u003cth style=\"text-align: right; padding: 10px 12px;\"\u003eMax Voltage (V RMS)\u003c\/th\u003e\n\u003cth style=\"text-align: right; padding: 10px 12px;\"\u003eClean Power\u003c\/th\u003e\n\u003cth style=\"text-align: left; padding: 10px 12px;\"\u003eUse Case\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e8 Ω\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e1.6 V\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e320 mW\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003eUltra-low impedance stability\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e16 Ω\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e2.6 V\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e422 mW\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003eHigh-current drive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e\u003cstrong\u003e32 Ω\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e\u003cstrong\u003e4.0 V\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e\u003cstrong\u003e500 mW\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003eStandard low-impedance benchmark\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e50 Ω\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e4.7 V\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e441 mW\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003eOptimized planar magnetic drive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e100 Ω\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e5.7 V\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e324 mW\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003eMid-impedance studio control\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e150 Ω\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e6.2 V\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e256 mW\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003eHigh-voltage swing stability\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e200 Ω\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e6.5 V\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e211 mW\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003ePremium audiophile matching\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e300 Ω\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e6.8 V\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e154 mW\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003eHigh-impedance reference standard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e600 Ω\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e7.0 V\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e81 mW\u003c\/td\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003eExtreme voltage studio drive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 0.5em;\"\u003e\u003cstrong\u003ePreamplifier output (unloaded line out):\u003c\/strong\u003e 8.0 V RMS max clean · residual noise floor ≤ −78 dBm.\u003c\/p\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 2em;\"\u003e\u003cstrong\u003eLoaded noise floor:\u003c\/strong\u003e ≤ −80 dBm into 32 Ω — acoustic silence on high-sensitivity headphones.\u003c\/p\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 0.5em;\"\u003e\u003cstrong\u003eAcoustic Performance — dB SPL at Max Clean Power\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 1em; color: #555;\"\u003e\u003cem\u003eReal-world headroom: how the Bravo's clean wattage translates into volume across different headphone efficiencies. 110 dB+ represents concert-level headroom.\u003c\/em\u003e\u003c\/p\u003e\n\u003ctable style=\"border-collapse: collapse; width: 100%; margin-bottom: 1.5em;\" cellspacing=\"0\" cellpadding=\"8\" border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"text-align: left; padding: 10px 12px;\"\u003eImpedance (Max Clean Power)\u003c\/th\u003e\n\u003cth style=\"text-align: right; padding: 10px 12px;\"\u003eLow Eff. (85 dB\/mW)\u003c\/th\u003e\n\u003cth style=\"text-align: right; padding: 10px 12px;\"\u003eMid Eff. (95 dB\/mW)\u003c\/th\u003e\n\u003cth style=\"text-align: right; padding: 10px 12px;\"\u003eHigh Eff. (100 dB\/mW)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e32 Ω (500 mW)\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e112 dB SPL\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e122 dB SPL\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e127 dB SPL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e150 Ω (256 mW)\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e109 dB SPL\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e119 dB SPL\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e124 dB SPL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e300 Ω (154 mW)\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e107 dB SPL\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e117 dB SPL\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e122 dB SPL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px 12px;\"\u003e600 Ω (81 mW)\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e104 dB SPL\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e114 dB SPL\u003c\/td\u003e\n\u003ctd style=\"text-align: right; padding: 10px 12px;\"\u003e119 dB SPL\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 2em; color: #555;\"\u003e\u003cem\u003eAcoustic immunity: high-impedance headphones (300–600 Ω) naturally restrict residual current, delivering a completely dark, pitch-black background.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eReviews\u003c\/h2\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 0.5em;\"\u003e\u003cstrong\u003e★★★★★  \"BRAVO — Extraordinary Class A 6SN7 \/ 6V6 Triode Mode Headphone Amplifier\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 0.5em;\"\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul style=\"line-height: 1.7; margin-bottom: 1.2em; padding-left: 1.5em;\"\u003e\n\u003cli\u003eEuphonic voicing\u003c\/li\u003e\n\u003cli\u003eBuild quality\u003c\/li\u003e\n\u003cli\u003eExcellent component parts\u003c\/li\u003e\n\u003cli\u003eGold-plated connections\u003c\/li\u003e\n\u003cli\u003eChoice of colors\u003c\/li\u003e\n\u003cli\u003eClass A — Triode mode\u003c\/li\u003e\n\u003cli\u003eCustom-wound transformers and chokes\u003c\/li\u003e\n\u003cli\u003ePre-amp\u003c\/li\u003e\n\u003cli\u003eTKD potentiometer\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 1.2em;\"\u003e\u003cstrong\u003eCons\u003c\/strong\u003e — Cost\u003c\/p\u003e\n\u003cp style=\"line-height: 1.7; margin-bottom: 1.5em;\"\u003e— Alex, via \u003ca href=\"https:\/\/www.head-fi.org\/showcase\/straitwire-x-eta-bravo-6v6-tube-headphone-amplifier.29160\/\"\u003eHead-Fi\u003c\/a\u003e · May 23, 2026\u003c\/p\u003e","brand":"Straitwire x ETA","offers":[{"title":"120","offer_id":51529481879848,"sku":"Bravo-1","price":2900.0,"currency_code":"USD","in_stock":true},{"title":"240","offer_id":51529481912616,"sku":"Bravo-2","price":2900.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/5705\/3736\/files\/54353452342.jpg?v=1772660431","url":"https:\/\/etaheadphones.com\/products\/bravo","provider":"ETA Audio","version":"1.0","type":"link"}