{"product_id":"5ar4-gz34-nos-amperex-by-philips-sittard-f31-x9a-dd-getter-tested-tube-rectifier-made-id-holland","title":"5AR4 ( GZ34 ) – Amperex Philips Sittard f31 X9A – DD Getter – Holland '50s – 100% Strong Tested – Rectifier Tube","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003e5AR4 ( GZ34 ) NOS NIB AMPEREX by Philips Sittard f31 X9A DD Getter, Tested Tube Rectifier MADE IN HOLLAND '50s\u003c\/strong\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eDescription:\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp class=\"\" data-end=\"1163\" data-start=\"530\"\u003eThe \u003cstrong data-end=\"556\" data-start=\"533\"\u003e5AR4 \/ GZ34 AMPEREX\u003c\/strong\u003e , made by \u003cstrong data-end=\"600\" data-start=\"572\"\u003ePhilips Sittard (Holland)\u003c\/strong\u003e in the 1950s, with \u003cstrong data-end=\"639\" data-start=\"621\"\u003ecode f31 X9A\u003c\/strong\u003e and \u003cstrong data-end=\"690\" data-start=\"642\"\u003edouble D-getter\u003c\/strong\u003e , is one of the rarest and most sought-after versions of this rectifier. Appreciated by enthusiasts for its \u003cstrong data-end=\"823\" data-start=\"801\"\u003esolid construction\u003c\/strong\u003e , \u003cstrong data-end=\"865\" data-start=\"828\"\u003eextraordinary electrical stability\u003c\/strong\u003e and \u003cstrong data-end=\"912\" data-start=\"871\"\u003enatural and musical sound contribution\u003c\/strong\u003e , it represents today one of the finest choices for powering high-end hi-fi and instrumental tube systems. This tube is \u003cstrong data-end=\"1064\" data-start=\"1057\"\u003eNOS\u003c\/strong\u003e , \u003cstrong data-end=\"1092\" data-start=\"1066\"\u003eelectrically tested\u003c\/strong\u003e , and comes from a selection of authentic \u003cem data-end=\"1162\" data-start=\"1145\"\u003eMade in Holland\u003c\/em\u003e examples.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1443\" data-start=\"1165\"\u003e\u003cstrong data-end=\"1174\" data-start=\"1165\"\u003eBass\u003c\/strong\u003e : compact and well articulated, with a solid and deep structure that supports the system without swelling. The low range is taut, precise, and always under control, with an excellent ability to support high dynamic loads without loss of definition.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1681\" data-start=\"1445\"\u003e\u003cstrong data-end=\"1453\" data-start=\"1445\"\u003eMids\u003c\/strong\u003e : transparent and linear, with a neutral and coherent timbre rendering. Voices and acoustic instruments are reproduced realistically, without emphasis, with a balance that enhances the naturalness of the sound message.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1913\" data-start=\"1683\"\u003e\u003cstrong data-end=\"1691\" data-start=\"1683\"\u003eHighs\u003c\/strong\u003e : Airy, refined and always musical. The high-end extension develops with delicacy and precision, helping to maintain a bright but never fatiguing soundstage, even in highly resolving amplifiers.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2196\" data-start=\"1915\"\u003e\u003cstrong data-end=\"1927\" data-start=\"1915\"\u003eDynamics\u003c\/strong\u003e : smooth and responsive, with a prompt response to current demands and a remarkable ability to handle the fastest transients without stiffening. Voltage delivery is progressive, well damped, with a beneficial effect on the overall coherence of the system.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"2473\" data-start=\"2198\"\u003e\u003cstrong data-end=\"2212\" data-start=\"2198\"\u003eSoundstage\u003c\/strong\u003e : tidy, stable and coherent. Even though it is a rectifier tube, the influence on the sound is clearly perceived in the \u003cstrong data-end=\"2374\" data-start=\"2348\"\u003ecleanliness of the black background\u003c\/strong\u003e , in the \u003cstrong data-end=\"2417\" data-start=\"2382\"\u003edefinition of the microdynamics\u003c\/strong\u003e and in the \u003cstrong data-end=\"2451\" data-start=\"2426\"\u003eoverall clarity\u003c\/strong\u003e of the musical scene.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"3010\" data-start=\"2475\"\u003eThe \u003cstrong data-end=\"2522\" data-start=\"2478\"\u003e5AR4 AMPEREX Sittard f31 Double D-Getter\u003c\/strong\u003e is ideal for integrated amplifiers, tube preamplifiers, single-ended or push-pull power amplifiers that use this type of rectifier. It is particularly suitable for systems that require \u003cstrong data-end=\"2741\" data-start=\"2717\"\u003emaximum reliability\u003c\/strong\u003e , \u003cstrong data-end=\"2781\" data-start=\"2743\"\u003evoltage stability over time\u003c\/strong\u003e and \u003cstrong data-end=\"2810\" data-start=\"2784\"\u003eabsence of coloration\u003c\/strong\u003e , such as in \u003cstrong data-end=\"2865\" data-start=\"2826\"\u003eboutique guitar amplifiers\u003c\/strong\u003e (e.g. \u003cstrong data-end=\"2883\" data-start=\"2871\"\u003eVox AC30\u003c\/strong\u003e , \u003cstrong data-end=\"2904\" data-start=\"2885\"\u003eMatchless DC-30\u003c\/strong\u003e ) where the quality of the power supply section is crucial to the sonic response of the entire circuit.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"3489\" data-start=\"3012\"\u003e🎯 \u003cstrong data-end=\"3041\" data-start=\"3015\"\u003eNote for audiophiles\u003c\/strong\u003e : \u003cbr data-end=\"3045\" data-start=\"3042\"\u003e\u003cstrong data-end=\"3068\" data-start=\"3054\"\u003eVery rare\u003c\/strong\u003e version with \u003cstrong data-end=\"3094\" data-start=\"3073\"\u003edouble D getter\u003c\/strong\u003e , sought after by collectors and enthusiasts for its combination of top-level electrical and musical performance. Ideal for those who want the best in terms of \u003cstrong data-end=\"3312\" data-start=\"3273\"\u003eclarity, articulation and neutrality\u003c\/strong\u003e , without introducing any unwanted coloration. A fundamental component for reference hi-fi systems or for vintage amplifiers restored with original components.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"569\" data-start=\"521\"\u003e🎸 \u003cstrong data-end=\"569\" data-start=\"524\"\u003eUse in Guitar and Bass Amplifiers\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"922\" data-start=\"571\"\u003eThe \u003cstrong data-end=\"618\" data-start=\"574\"\u003e5AR4 AMPEREX Sittard with Double D-Getter\u003c\/strong\u003e , thanks to its \u003cstrong data-end=\"679\" data-start=\"636\"\u003esmooth and stable tension delivery\u003c\/strong\u003e , is one of the most sought-after rectifiers also in the instrumental field. Its progressive, never aggressive response favors a \u003cstrong data-end=\"835\" data-start=\"810\"\u003enatural compression\u003c\/strong\u003e , much appreciated by musicians who want a \u003cstrong data-end=\"921\" data-start=\"892\"\u003ewarm, round and dynamic\u003c\/strong\u003e sound.\u003c\/p\u003e\n\u003cp class=\"\" data-end=\"1385\" data-start=\"924\"\u003eIt is particularly suited to circuits that benefit from well-damped tube rectification, such as those found in \u003cstrong data-end=\"1058\" data-start=\"1046\"\u003ethe Vox AC30\u003c\/strong\u003e , \u003cstrong data-end=\"1078\" data-start=\"1060\"\u003eMarshall JTM45\u003c\/strong\u003e , \u003cstrong data-end=\"1100\" data-start=\"1080\"\u003eHiwatt DR Series\u003c\/strong\u003e , \u003cstrong data-end=\"1121\" data-start=\"1102\"\u003eMatchless DC-30\u003c\/strong\u003e , or in boutique amps built with NOS parts. In these contexts, the Sittard AMPEREX offers a \u003cstrong data-end=\"1244\" data-start=\"1221\"\u003econtrolled attack\u003c\/strong\u003e , \u003cstrong data-end=\"1269\" data-start=\"1249\"\u003emusical sustain\u003c\/strong\u003e , and a \u003cstrong data-end=\"1309\" data-start=\"1276\"\u003esmooth transition to breakup\u003c\/strong\u003e , contributing to a natural, consistent, and always musical touch response.\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\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSection 1:\u003c\/strong\u003e\u003c\/span\u003e \u003cspan\u003eIa = 100 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 = 102 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\u003eMicrophony:\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\u003eNOS - NIB - New Old Stock, New In Box - Tested and working - Supplied in original box (see photo for box condition).\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\u003eAesthetic conditions:\u003c\/strong\u003e \u003cspan\u003eSufficient – Writings almost completely disappeared. 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\u0026nbsp;\u003c\/span\u003e\u003c\/strong\u003ef31 X9A - Manufactured in the Sittard plant - in January 1959\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003ca rel=\"noopener\" title=\"Why our tubes are different – the VTT protocol that improves sound, reliability and durability\" href=\"https:\/\/vacuumtubestreasures.com\/blogs\/notizie\/perche-le-nostre-valvole-sono-diverse\" target=\"_blank\"\u003e\u003cstrong\u003eFind out why our valves are different →\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e","brand":"AMPEREX","offers":[{"title":"Default Title","offer_id":53507510796636,"sku":"02598L","price":299.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0616\/3775\/5127\/files\/10_f301b121-5045-421d-93ff-c57e040721a0.jpg?v=1732370878","url":"https:\/\/vacuumtubestreasures.com\/en-de\/products\/5ar4-gz34-nos-amperex-by-philips-sittard-f31-x9a-dd-getter-tested-tube-rectifier-made-id-holland","provider":"Vacuum Tubes Treasures","version":"1.0","type":"link"}