{"product_id":"gz33-amperex-bugleboy-by-mullard-blackburn-halo-getter-made-in-great-britain-64","title":"GZ33 AMPEREX BugleBoy by Mullard Blackburn Halo Getter Made in Great Britain '64","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cstrong\u003eGZ33 AMPEREX BugleBoy by Mullard Blackburn Halo Getter Made in Great Britain '64\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-end=\"642\" data-start=\"169\"\u003eRare \u003cstrong data-end=\"205\" data-start=\"197\"\u003eGZ33\u003c\/strong\u003e rectifier tube produced in \u003cstrong data-end=\"227\" data-start=\"219\"\u003e1964\u003c\/strong\u003e at the historic \u003cstrong data-end=\"279\" data-start=\"255\"\u003eMullard factory in Blackburn\u003c\/strong\u003e , and branded \u003cstrong data-end=\"314\" data-start=\"293\"\u003eAMPEREX Bugle Boy\u003c\/strong\u003e for the international market. This unit is tested with \u003cstrong data-end=\"409\" data-start=\"394\"\u003every strong\u003c\/strong\u003e values, fully in line with those of a \u003cstrong data-end=\"464\" data-start=\"457\"\u003eNOS\u003c\/strong\u003e tube. It is therefore a tube with \u003cstrong data-end=\"542\" data-start=\"502\"\u003every few hours of actual use\u003c\/strong\u003e , ideal for those looking for an original Mullard GZ33 without having to pay the full price of the NOS NIB.\u003c\/p\u003e\n\u003cp data-end=\"949\" data-start=\"644\"\u003eThe internal structure is the classic one of the best British GZ33s: \u003cstrong data-end=\"758\" data-start=\"716\"\u003ering-shaped getter (halo getter)\u003c\/strong\u003e , \u003cstrong data-end=\"785\" data-start=\"760\"\u003egenerous black plates\u003c\/strong\u003e , robust construction, thick, slightly burnished glass. The Bugle Boy branding is still clearly visible, confirming the authenticity of the Mullard production for Amperex.\u003c\/p\u003e\n\u003ch3 data-end=\"1010\" data-start=\"956\"\u003eTimbral characteristics and sound behavior\u003c\/h3\u003e\n\u003cp data-end=\"1213\" data-start=\"1012\"\u003e\u003cstrong data-end=\"1022\" data-start=\"1012\"\u003eBass:\u003c\/strong\u003e\u003cbr data-end=\"1025\" data-start=\"1022\"\u003eDeep, controlled, and with great authority. The GZ33 is known for offering extremely stable power, resulting in precise and well-defined low-frequency extension.\u003c\/p\u003e\n\u003cp data-end=\"1403\" data-start=\"1215\"\u003e\u003cstrong data-end=\"1224\" data-start=\"1215\"\u003eMedium:\u003c\/strong\u003e\u003cbr data-end=\"1227\" data-start=\"1224\"\u003eTransparent and neutral. Compared to tubes like the GZ34, the GZ33 provides a more solid and colorless behavior, ideal for those seeking maximum tonal balance.\u003c\/p\u003e\n\u003cp data-end=\"1537\" data-start=\"1405\"\u003e\u003cstrong data-end=\"1414\" data-start=\"1405\"\u003eHighs:\u003c\/strong\u003e \u003cbr data-end=\"1417\" data-start=\"1414\"\u003eClean and never harsh. Even with complex loads, the top end remains airy and defined, without overemphasizing the brilliance.\u003c\/p\u003e\n\u003cp data-end=\"1742\" data-start=\"1539\"\u003e\u003cstrong data-end=\"1552\" data-start=\"1539\"\u003eDynamics:\u003c\/strong\u003e\u003cbr data-end=\"1555\" data-start=\"1552\"\u003eExcellent current reserve, with stable dynamic response. Ideal for systems requiring a rectifier capable of handling even heavy loads without compression.\u003c\/p\u003e\n\u003cp data-end=\"1964\" data-start=\"1744\"\u003e\u003cstrong data-end=\"1759\" data-start=\"1744\"\u003eSoundstage:\u003c\/strong\u003e\u003cbr data-end=\"1762\" data-start=\"1759\"\u003eStable and well-focused soundstage, with excellent instrument separation. The soundstage is wide and solid, especially in push-pull configurations or with high-power amplifiers.\u003c\/p\u003e\n\u003ch3 data-end=\"2004\" data-start=\"1971\"\u003e🎧 Use in Hi-Fi amplifiers\u003c\/h3\u003e\n\u003cp data-end=\"2283\" data-start=\"2006\"\u003eIdeal for \u003cstrong data-end=\"2054\" data-start=\"2031\"\u003ehigh-end power\u003c\/strong\u003e amplifiers, especially \u003cstrong data-end=\"2091\" data-start=\"2068\"\u003etube push-pull amplifiers\u003c\/strong\u003e , where power supply robustness plays a key role in dynamic handling. Also perfect for preamplifiers or driver stages that require high voltage stability.\u003c\/p\u003e\n\u003ch3 data-end=\"2340\" data-start=\"2290\"\u003e🎸 Use in musical instrument amplifiers\u003c\/h3\u003e\n\u003cp data-end=\"2639\" data-start=\"2342\"\u003eThe GZ33 is a rare but excellent choice for \u003cstrong data-end=\"2406\" data-start=\"2394\"\u003eboutique\u003c\/strong\u003e applications, such as \u003cstrong data-end=\"2458\" data-start=\"2427\"\u003ecustom guitar or bass\u003c\/strong\u003e amplifiers with point-to-point architecture. It is less compressed than the GZ34, providing \u003cstrong data-end=\"2584\" data-start=\"2563\"\u003egreater headroom\u003c\/strong\u003e while maintaining definition even on clean or crunch sounds.\u003c\/p\u003e\n\u003ch3 data-end=\"2681\" data-start=\"2646\"\u003e🎯 Note for audiophiles and technicians\u003c\/h3\u003e\n\u003cp data-end=\"3065\" data-start=\"2683\"\u003eThe Mullard GZ33 is one of the \u003cstrong data-end=\"2744\" data-start=\"2726\"\u003emost respected\u003c\/strong\u003e rectifiers in audio: hard to find, even rarer if marked Amperex \u003cstrong data-end=\"2833\" data-start=\"2820\"\u003eBugle Boy\u003c\/strong\u003e . This example, although \u003cstrong data-end=\"2866\" data-start=\"2857\"\u003eused\u003c\/strong\u003e , has \u003cstrong data-end=\"2907\" data-start=\"2877\"\u003every strong test values\u003c\/strong\u003e and a well-preserved aesthetic. An excellent choice for those who want \u003cstrong data-end=\"3013\" data-start=\"2980\"\u003eoriginal Mullard performance\u003c\/strong\u003e , at a more affordable price than a NOS NIB.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eTest Results:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eTubes tested on \u003cstrong\u003e\u003cspan\u003eFUNKE W19\u003c\/span\u003e\u003c\/strong\u003e Tube tester:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eTest Conditions:\u003c\/strong\u003e Va = 60V, Vf = 5V\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eGood from:\u003c\/strong\u003e Ia = 55 mA\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eAverage 100%:\u003c\/strong\u003e Ia = 100 mA\u003cbr\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eTest Result:\u003c\/strong\u003e VERY STRONG\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003ePlate current:\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eValve:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003c\/span\u003e \u003cspan\u003eIa = 94 mA\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSection 2:\u003c\/strong\u003e\u003c\/span\u003e \u003cspan\u003eIa = 94 mA\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eAdditional Tests\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eMicrophonics:\u003c\/strong\u003e Standard. Tested and approved for use in hi-fi and guitar amplifiers.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOutput Quality:\u003c\/strong\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cspan\u003eExcellent – Very strong and stable output, no fluctuations.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eShort circuits and GAS:\u003c\/strong\u003e Absent.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003e\u003cstrong\u003eConditions:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eConditions:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003eVintage Valves - Tested and in perfect working order - Supplied in original box.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eFunctionality:\u003c\/strong\u003e Fully functional.\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCosmetic condition:\u003c\/strong\u003e \u003cspan\u003eExcellent – Excellently preserved lettering, minimal signs of wear. See photos for details.\u003c\/span\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eManufacturing Code:\u003cspan\u003e \u003c\/span\u003e\u003c\/strong\u003ers1 B4D1 - Manufactured at the Blackburn factory - 1st week of April 1964\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MULLARD","offers":[{"title":"Default Title","offer_id":55100591112540,"sku":"03029I","price":259.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/2_093a65e6-4c6f-40be-b164-aefd786de62f.jpg?v=1753437658","url":"https:\/\/vacuumtubestreasures.com\/en-lt\/products\/gz33-amperex-bugleboy-by-mullard-blackburn-halo-getter-made-in-great-britain-64","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}