{"product_id":"telefunken-kt88-tk-vacuum-tube-matched-quad-black-diamond-series-vacuum-tubes","title":"TELEFUNKEN KT88-TK Vacuum Tube Matched Quad","description":"\u003cdiv style=\"font-family:'Helvetica Neue',Arial,sans-serif;color:#1A1A2A;max-width:900px;margin:0 auto;line-height:1.6;font-size:15px;\"\u003e\n\u003ch3 style=\"font-size:17px;font-weight:700;color:#0D1B3E;text-transform:uppercase;letter-spacing:.06em;margin:4px 0 12px;padding:0 0 7px;border-bottom:2px solid #006D77;\"\u003eProduct overview\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 16px;font-size:16.5px;color:#0D1B3E;\"\u003eThe \u003cstrong\u003eTELEFUNKEN KT88-TK Vacuum Tube Matched Quad\u003c\/strong\u003e is a newly manufactured, cryogenically treated version of the legendary KT88 beam-power tetrode, supplied here as a matched quad of KT88-TK tubes.\u003c\/p\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eThe KT88-TK shares similar applications with the 6L6 and EL34 and is one of the largest tubes in its class. Its characteristics of high power and low distortion make it ideal for guitar amplifier applications where the player is seeking a higher gain tone with less distortion than a 6550 provides.\u003c\/p\u003e\n\u003ctable style=\"border-collapse:collapse;margin:6px 0 18px;width:100%;max-width:100%;table-layout:fixed;\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:12px 8px;text-align:left;border:1px solid #DDE2E8;vertical-align:top;word-break:normal;overflow-wrap:break-word;width:55%;color:#5a6170;font-size:13px;text-transform:uppercase;letter-spacing:.05em;\"\u003ePlate voltage, up to\u003c\/td\u003e\n\u003ctd style=\"padding:12px 8px;text-align:left;border:1px solid #DDE2E8;vertical-align:top;word-break:normal;overflow-wrap:break-word;font-weight:bold;color:#006d77;font-size:17px;\"\u003e800 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:12px 8px;text-align:left;border:1px solid #DDE2E8;vertical-align:top;word-break:normal;overflow-wrap:break-word;width:55%;color:#5a6170;font-size:13px;text-transform:uppercase;letter-spacing:.05em;\"\u003eKT88 introduced\u003c\/td\u003e\n\u003ctd style=\"padding:12px 8px;text-align:left;border:1px solid #DDE2E8;vertical-align:top;word-break:normal;overflow-wrap:break-word;font-weight:bold;color:#006d77;font-size:17px;\"\u003e1956\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:12px 8px;text-align:left;border:1px solid #DDE2E8;vertical-align:top;word-break:normal;overflow-wrap:break-word;width:55%;color:#5a6170;font-size:13px;text-transform:uppercase;letter-spacing:.05em;\"\u003eTubes in this product\u003c\/td\u003e\n\u003ctd style=\"padding:12px 8px;text-align:left;border:1px solid #DDE2E8;vertical-align:top;word-break:normal;overflow-wrap:break-word;font-weight:bold;color:#006d77;font-size:17px;\"\u003e4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:12px 8px;text-align:left;border:1px solid #DDE2E8;vertical-align:top;word-break:normal;overflow-wrap:break-word;width:55%;color:#5a6170;font-size:13px;text-transform:uppercase;letter-spacing:.05em;\"\u003eTreated, tested and burned‑in\u003c\/td\u003e\n\u003ctd style=\"padding:12px 8px;text-align:left;border:1px solid #DDE2E8;vertical-align:top;word-break:normal;overflow-wrap:break-word;font-weight:bold;color:#006d77;font-size:17px;\"\u003eCryogenic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3 style=\"font-size:17px;font-weight:700;color:#0D1B3E;text-transform:uppercase;letter-spacing:.06em;margin:30px 0 12px;padding:0 0 7px;border-bottom:2px solid #006D77;\"\u003eKey features\u003c\/h3\u003e\n\u003cul style=\"margin:0 0 14px;padding-left:20px;\"\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003e\n\u003cstrong\u003eKT88 beam-power tetrode\u003c\/strong\u003e, one of the largest tubes in its class\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003e\u003cstrong\u003eHandles a plate voltage of up to 800 V\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003e\u003cstrong\u003eHigh power and low distortion\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003e\n\u003cstrong\u003eClassic KT88 mid-range\u003c\/strong\u003e with an expanded low end and very high end\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003e\n\u003cstrong\u003eShares applications\u003c\/strong\u003e with the 6L6 and EL34\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003e\n\u003cstrong\u003eBlack Diamond Series\u003c\/strong\u003e: rigorously tested, cryogenically treated and extensively burned-in\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"font-size:17px;font-weight:700;color:#0D1B3E;text-transform:uppercase;letter-spacing:.06em;margin:30px 0 12px;padding:0 0 7px;border-bottom:2px solid #006D77;\"\u003eThe KT88-TK sound\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eTonally, the Black Diamond Series KT88-TK has the same characteristic mid-range as the original KT88, with an expanded low end and very high end. Its rigorous quality control and durable construction yield a dependable tube ready for the most demanding applications.\u003c\/p\u003e\n\u003ch3 style=\"font-size:17px;font-weight:700;color:#0D1B3E;text-transform:uppercase;letter-spacing:.06em;margin:30px 0 12px;padding:0 0 7px;border-bottom:2px solid #006D77;\"\u003eA power amplification favourite\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eIntroduced in 1956, the KT88 offered an alternative to the 6550, and with the ability to handle a much higher plate voltage of up to 800 V it became a common choice for power amplification design.\u003c\/p\u003e\n\u003ch3 style=\"font-size:17px;font-weight:700;color:#0D1B3E;text-transform:uppercase;letter-spacing:.06em;margin:30px 0 12px;padding:0 0 7px;border-bottom:2px solid #006D77;\"\u003eApplications\u003c\/h3\u003e\n\u003cul style=\"margin:0 0 14px;padding-left:20px;\"\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003e\n\u003cstrong\u003eHi-fi power amplifier\u003c\/strong\u003e: home audio power amplifiers designed around the KT88\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003e\n\u003cstrong\u003eGuitar amplifier\u003c\/strong\u003e: guitarists seeking a higher gain tone with less distortion\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003e\n\u003cstrong\u003eHigh-power amplifier with four tubes\u003c\/strong\u003e: amplifiers that run four KT88 power tubes\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003e\n\u003cstrong\u003eStudio backline\u003c\/strong\u003e: studios keeping their KT88 amplifiers session-ready\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003e\n\u003cstrong\u003eLive sound and touring spares\u003c\/strong\u003e: backline techs carrying replacement power tubes\u003c\/li\u003e\n\u003cli style=\"margin:0 0 6px;\"\u003e\n\u003cstrong\u003eRental inventory\u003c\/strong\u003e: rental stores retubing amplifiers between bookings\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"font-size:17px;font-weight:700;color:#0D1B3E;text-transform:uppercase;letter-spacing:.06em;margin:30px 0 12px;padding:0 0 7px;border-bottom:2px solid #006D77;\"\u003eBlack Diamond Series\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eTELEFUNKEN Elektroakustik Black Diamond Series vacuum tubes are new production tubes, manufactured in partnership with a specialist vacuum tube factory in Slovakia and designed to be harmonically rich and tonally balanced. Each tube is rigorously tested, cryogenically treated and extensively burned-in before it carries the Black Diamond name, so the KT88-TK arrives ready for the most demanding applications.\u003c\/p\u003e\n\u003ch3 style=\"font-size:17px;font-weight:700;color:#0D1B3E;text-transform:uppercase;letter-spacing:.06em;margin:30px 0 12px;padding:0 0 7px;border-bottom:2px solid #006D77;\"\u003eThis configuration: Matched Quad\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eThis product is a \u003cstrong\u003eMatched Quad\u003c\/strong\u003e: four KT88-TK tubes matched by TELEFUNKEN and supplied together as one set. Keep a matched set together in the four positions of the same circuit.\u003c\/p\u003e\n\u003ch3 style=\"font-size:17px;font-weight:700;color:#0D1B3E;text-transform:uppercase;letter-spacing:.06em;margin:30px 0 12px;padding:0 0 7px;border-bottom:2px solid #006D77;\"\u003eFitting and care\u003c\/h3\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eAlways switch the equipment off, unplug it from the mains and let the tubes cool completely before removing or fitting a tube. Fit the KT88-TK only in a socket specified for the KT88, keep each tube in the position of the one it replaces, and press it straight and fully into the socket. Power sections hold high voltages, so leave any work inside the chassis, including any bias adjustment the amplifier requires, to a qualified technician. After fitting, let the equipment warm up and listen at low volume first. Store spare tubes in their packaging, protected from knocks and moisture.\u003c\/p\u003e\n\u003ch3 style=\"font-size:17px;font-weight:700;color:#0D1B3E;text-transform:uppercase;letter-spacing:.06em;margin:30px 0 12px;padding:0 0 7px;border-bottom:2px solid #006D77;\"\u003eWhat's included\u003c\/h3\u003e\n\u003ctable style=\"border-collapse:collapse;margin:0 0 14px;font-size:14px;width:100%;max-width:100%;table-layout:fixed;\"\u003e\u003ctbody\u003e\n\u003ctr style=\"background:#F5F7F9;\"\u003e\n\u003ctd style=\"font-weight:600;color:#0D1B3E;padding:8px 10px;border-bottom:1px solid #DDE2E8;vertical-align:top;word-break:normal;overflow-wrap:break-word;width:38%;\"\u003eIncluded\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #DDE2E8;vertical-align:top;word-break:normal;overflow-wrap:break-word;\"\u003eFour TELEFUNKEN KT88‑TK vacuum tubes (matched quad)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#FFFFFF;\"\u003e\n\u003ctd style=\"font-weight:600;color:#0D1B3E;padding:8px 10px;border-bottom:1px solid #DDE2E8;vertical-align:top;word-break:normal;overflow-wrap:break-word;width:38%;\"\u003eNot included\u003c\/td\u003e\n\u003ctd style=\"padding:8px 10px;border-bottom:1px solid #DDE2E8;vertical-align:top;word-break:normal;overflow-wrap:break-word;\"\u003eAmplifier or equipment, sockets and installation, bias adjustment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch3 style=\"font-size:17px;font-weight:700;color:#0D1B3E;text-transform:uppercase;letter-spacing:.06em;margin:30px 0 12px;padding:0 0 7px;border-bottom:2px solid #006D77;\"\u003eIn the box\u003c\/h3\u003e\n\u003cul style=\"margin:0 0 14px;padding-left:20px;\"\u003e\u003cli style=\"margin:0 0 6px;\"\u003eFour TELEFUNKEN KT88-TK vacuum tubes (matched quad)\u003c\/li\u003e\u003c\/ul\u003e\n\u003cp style=\"margin:10px 0 14px;padding:10px 14px;background:#F5F7F9;border-left:3px solid #006D77;font-size:14px;color:#1A1A2A;\"\u003eVacuum tubes are glass components: handle them by the glass envelope, avoid knocks and keep them in their packaging until fitting.\u003c\/p\u003e\n\u003ch3 style=\"font-size:17px;font-weight:700;color:#0D1B3E;text-transform:uppercase;letter-spacing:.06em;margin:30px 0 12px;padding:0 0 7px;border-bottom:2px solid #006D77;\"\u003eTELEFUNKEN KT88-TK Vacuum Tube Matched Quad: frequently asked questions\u003c\/h3\u003e\n\u003ch4 style=\"font-size:15px;font-weight:700;color:#0D1B3E;margin:18px 0 6px;\"\u003eWhat plate voltage can the KT88 handle?\u003c\/h4\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eTELEFUNKEN states that the KT88 can handle a plate voltage of up to 800 V.\u003c\/p\u003e\n\u003ch4 style=\"font-size:15px;font-weight:700;color:#0D1B3E;margin:18px 0 6px;\"\u003eHow does it sound?\u003c\/h4\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eTELEFUNKEN describes the characteristic mid-range of the original KT88 with an expanded low end and very high end, plus high power and low distortion.\u003c\/p\u003e\n\u003ch4 style=\"font-size:15px;font-weight:700;color:#0D1B3E;margin:18px 0 6px;\"\u003eWhat does Black Diamond Series mean?\u003c\/h4\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eIt is TELEFUNKEN Elektroakustik's range of new production vacuum tubes, designed to be harmonically rich and tonally balanced; each tube is rigorously tested, cryogenically treated and extensively burned-in.\u003c\/p\u003e\n\u003ch4 style=\"font-size:15px;font-weight:700;color:#0D1B3E;margin:18px 0 6px;\"\u003eDo I need a technician to fit it?\u003c\/h4\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eFitting is a straight swap in the socket, but power sections and rectifier circuits hold high voltages. Where an amplifier has adjustable bias, have a qualified technician check it after fitting new power tubes, following the amplifier maker's instructions.\u003c\/p\u003e\n\u003ch4 style=\"font-size:15px;font-weight:700;color:#0D1B3E;margin:18px 0 6px;\"\u003eHow many tubes are included?\u003c\/h4\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eFour tubes, matched by TELEFUNKEN and supplied as one set (Matched Quad).\u003c\/p\u003e\n\u003ch4 style=\"font-size:15px;font-weight:700;color:#0D1B3E;margin:18px 0 6px;\"\u003eWhere can I buy the TELEFUNKEN KT88-TK Vacuum Tube Matched Quad in India?\u003c\/h4\u003e\n\u003cp style=\"margin:0 0 12px;\"\u003eThe TELEFUNKEN KT88-TK Vacuum Tube Matched Quad is available from \u003cstrong\u003eShivansh Electronics, Kolkata, West Bengal, India\u003c\/strong\u003e, with delivery across India.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Shivansh Electronics","offers":[{"title":"Default Title","offer_id":67947060691311,"sku":"TELEFUNKEN-KT88-TK-Vacuum-Tube-Matched-Quad","price":77600.0,"currency_code":"INR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0964\/4766\/0399\/files\/TELEFUNKEN-KT88-TK-VACUUM-TUBE-MATCHED-QUAD-TELEFUNKEN-ADD-ONS-SHIVANSH-ELECTRONICS-1.webp?v=1793329795","url":"https:\/\/shivanshelectronics.in\/products\/telefunken-kt88-tk-vacuum-tube-matched-quad-black-diamond-series-vacuum-tubes","provider":"Shivansh Electronics","version":"1.0","type":"link"}