{"product_id":"kt66","title":"KT66","description":"\u003ch2\u003eKT66 tube specs\u003c\/h2\u003e\n\u003cp\u003eThe KT66 is a classic \u003ca href=\"https:\/\/pentalabs.com\/collections\/tetrodes\" target=\"_blank\" rel=\"noopener\"\u003ebeam power tetrode\u003c\/a\u003e used in both vintage-inspired and modern audio equipment. It is commonly chosen where a KT66 amp is expected to deliver strong musical headroom, smooth response, and the broader bottle-style construction associated with this valve family. Below are general specifications for reference. Full operating values, curves, and recommended conditions should always be confirmed on the relevant data sheet for the exact tube version being used.\u003c\/p\u003e\n\u003cp\u003eBelow are general specifications. Please refer to the downloadable datasheet for complete details.\u003c\/p\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; border: 1px solid #ccc;\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 8px; text-align: left;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"border: 1px solid #ccc; padding: 8px; text-align: left;\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003eTube Type\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003eBeam power tetrode\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003eBase\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003eOctal, 8-pin\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003eHeater Voltage\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003e6.3 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003eHeater Current\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003e1.27 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003eMaximum Plate Voltage\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003e500 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003eMaximum Screen Voltage\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003e400 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003ePlate Dissipation\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003e25 W to 30 W, depending on data source and tube version\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003eScreen Dissipation\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003e3.5 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003eCooling\u003c\/td\u003e\n\u003ctd style=\"border: 1px solid #ccc; padding: 8px;\"\u003eNatural air \/ convection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eKT66 data sheet download\u003c\/h3\u003e\n\u003cp\u003eDownload the KT66 data sheet to review electrical characteristics, pinout, limiting values, and typical operating conditions for KT66 amplifier servicing, replacement planning, and amplifier design work.\u003c\/p\u003e\n\u003ch3\u003eKT66 vacuum tube substitute \u0026amp; equivalent information\u003c\/h3\u003e\n\u003cp\u003eThe KT66 is widely used in audio applications and is commonly compared against both vintage-style and current-production replacements from major tube brands. Common search intent includes Genalex, Mullard, JJ Electronic, PSVANE, TAD, and Shuguang KT66 replacement options, especially where buyers are trying to match tone, fit, and operating behavior across modern production runs.\u003c\/p\u003e\n\u003cp\u003eKT66 tubes are also regularly associated with amplifiers from brands such as Marshall, Tone King, Dr Z, and Victory. In some amplifiers, 6L6GC, 5881, and sometimes KT77 are considered possible substitutes, but that is never a universal rule and should always be confirmed against the amplifier’s circuit design, bias requirements, socket compatibility, and manufacturer guidance before installation.\u003c\/p\u003e\n\u003cp\u003eIf you need help choosing the right replacement set, contact Pentalabs. As experienced \u003ca href=\"https:\/\/pentalabs.com\/\" target=\"_blank\" rel=\"noopener\"\u003evacuum tube dealers\u003c\/a\u003e, we can help you compare options for \u003ca href=\"https:\/\/pentalabs.com\/collections\/hi-fi-audio-amplification\" target=\"_blank\" rel=\"noopener\"\u003eHiFi tubes\u003c\/a\u003e and \u003ca href=\"https:\/\/pentalabs.com\/collections\/guitar-amp-tubes\" target=\"_blank\" rel=\"noopener\"\u003eguitar amp tube replacement\u003c\/a\u003e.\u003c\/p\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":45638860833012,"sku":"","price":0.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0707\/6996\/7348\/files\/front-1000x1000-1.jpg?v=1721368456","url":"https:\/\/pentalabs.com\/products\/kt66","provider":"Penta Laboratories","version":"1.0","type":"link"}