{"title":"Valves","description":null,"products":[{"product_id":"3-500zg-pentalabs-matched-pair-triodo-di-potenza-hi-mu-factory-matched-pair","title":"3-500ZG PENTALABS MATCHED PAIR -Hi Mu power triode factory matched pair","description":"\u003cp style=\"text-align: center;\"\u003e\u003cimg alt=\" src=\" https: style=\"width: 230px; height: 212px;\"\u003e\u003c\/p\u003e\n\n\u003ch3 style=\"text-align: center;\"\u003e\u003cstrong\u003e\u003cspan style=\"font-size:16px;\"\u003ePAIR OF 3-500ZG(H) PENTALABS MATCHED PAIR by Ig, Hi Mu\u003c\/span\u003e\u003c\/strong\u003e\u003c\/h3\u003e\n\n\u003cp style=\"text-align: center;\"\u003ePower triode for amplifiers\u003c\/p\u003e\n\n\u003cp style=\"text-align: center;\"\u003e \u003c\/p\u003e\n\n\u003cp style=\"text-align: center;\"\u003e\u003cimg alt=\" src=\" https: style=\"width: 500px; height: 333px;\"\u003e\u003c\/p\u003e\n\n\u003cp style=\"text-align: center;\"\u003e \u003c\/p\u003e\n\n\u003cp style=\"text-align: center;\"\u003eNew, sealed, and factory-selected to ensure matched pairing of the two tubes. Each tube comes with an individual datasheet with measured currents.\u003c\/p\u003e\n\n\u003cp style=\"text-align: center;\"\u003eThe 3-500ZG Pentalabs are ZGH, where H stands for high Mu. One-year warranty against manufacturing defects.\u003c\/p\u003e","brand":"Pentalabs","offers":[{"title":"Default Title","offer_id":51683962061146,"sku":"3-500ZGH-MP","price":539.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0946\/2113\/9290\/files\/3287.jpg?v=1754996157"},{"product_id":"572b-electron-valvola-di-potenza-per-radiofrequenza-e-audio","title":"572B Radio-frequency and audio power valve","description":"\u003cmeta charset=\"UTF-8\"\u003e\u003cdiv style=\"font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; width: 100%; max-width: 900px; margin: 0 auto; border: 1px solid #e2e8f0; background-color: #ffffff; line-height: 1.6; position: relative; overflow: hidden;\"\u003e\n\n\u003c!-- WATERMARK ALWAYS IN FOREGROUND (z-index: 99) BUT TRANSPARENT AND PHANTOM --\u003e\u003cdiv style=\"position: absolute; top: 55%; left: 50%; width: 450px; height: 450px; background-image: url('https:\/\/cdn.shopify.com\/s\/files\/1\/0946\/2113\/9290\/files\/hrs_logo_new_senza_scritta.png?v=1776699756'); background-repeat: no-repeat; background-size: contain; background-position: center; opacity: 0.04; pointer-events: none; z-index: 99; transform: translate(-30%, -50%) rotate(-15deg);\"\u003e\u003c\/div\u003e\n\n\u003c!-- Header - Componentry \/ Power Tubes Style (Anthracite Background \u0026 Amber Detail) --\u003e\u003cdiv style=\"position: relative; padding: 50px 5%; border-bottom: 8px solid #d97706; background-color: #334155; z-index: 2;\"\u003e\n\n\u003c!-- Category Label --\u003e\u003cdiv style=\"position: absolute; top: 25px; right: 5%; z-index: 10;\"\u003e\u003cdiv style=\"background: #d97706; color: #ffffff; font-size: 11px; font-weight: 900; text-transform: uppercase; letter-spacing: 2px; padding: 8px 18px; border-radius: 3px;\"\u003eTHERMIONIC VALVES\u003c\/div\u003e\u003c\/div\u003e\n\n\u003cdiv style=\"position: relative; z-index: 2;\"\u003e\n\n\u003ch1 style=\"margin: 0 !important; font-size: 36px !important; text-transform: uppercase !important; letter-spacing: -1px !important; font-weight: 900 !important; line-height: 1.1 !important; color: #ffffff;\"\u003e572B\u003c\/h1\u003e\n\n\u003cp style=\"margin: 15px 0 0 !important; font-size: 18px !important; color: #fde68a; font-weight: 300 !important; text-transform: uppercase !important; letter-spacing: 3px !important;\"\u003eHigh-Mu Power Triode – RF \u0026amp; AUDIO\u003c\/p\u003e\n\n\u003cp style=\"margin: 12px 0 0 !important; font-size: 13px !important; color: #ffffff !important; font-weight: 600 !important; letter-spacing: 2px !important; text-transform: uppercase !important;\"\u003eHigh Dissipation Graphite Anode – Ideal for HF Linear Amplifiers\u003c\/p\u003e\n\n\u003cdiv style=\"width: 60px; height: 4px; background: #d97706; margin-top: 20px; border-radius: 2px;\"\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Content --\u003e\u003cdiv style=\"padding: 40px 5%; position: relative; z-index: 2;\"\u003e\n\n\u003c!-- Key Features Box - TRANSPARENT\/ALMOST WHITE BACKGROUND --\u003e\u003cdiv style=\"margin-bottom: 35px; border-left: 4px solid #d97706; padding: 20px; background-color: #fffbeb; border-radius: 0 8px 8px 0; position: relative; z-index: 2;\"\u003e\n\n\u003ch2 style=\"color: #b45309; font-size: 15px; text-transform: uppercase; letter-spacing: 2px; margin: 0 0 10px 0; font-weight: 900;\"\u003eCONSTRUCTION EXCELLENCE AND RELIABILITY\u003c\/h2\u003e\n\n\u003cp style=\"color: #1e293b; font-size: 15px; margin: 0; line-height: 1.6; font-weight: 500;\"\u003e• \u003cstrong\u003eSUPERIOR ANODE DISSIPATION:\u003c\/strong\u003e Robust structure designed to withstand heavy duty cycles without thermal deformation, ensuring a long operational life.\u003cbr\u003e\u003cbr\u003e        • \u003cstrong\u003eDUAL APPLICATION:\u003c\/strong\u003e Optimized for both radio frequency use (up to HF frequencies in Class AB2 or B linear amplifiers) and high-end radiant tube Hi-Fi audio amplifier output stages.\u003cbr\u003e\u003cbr\u003e        • \u003cstrong\u003eHIGH AMPLIFICATION FACTOR (MU):\u003c\/strong\u003e Allows for high power gains with minimal input drive requirements.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Product Description --\u003e\u003cdiv style=\"margin-bottom: 40px; background: transparent; position: relative; z-index: 2;\"\u003e\n\n\u003ch2 style=\"color: #1e293b; font-size: 24px; margin-bottom: 15px; border-bottom: 2px solid #e2e8f0; padding-bottom: 10px; text-transform: uppercase; letter-spacing: 1px;\"\u003eMaximum Performance in HF Linears and Audio Systems\u003c\/h2\u003e\n\n\u003cp style=\"font-size: 16px; color: #475569; line-height: 1.7; text-align: justify; margin-bottom: 20px;\"\u003eThe 572B thermionic valve is a high-gain, direct-heated power triode, widely used in the repair, restoration, and upgrade of well-known amateur radio linear amplifiers (such as the classic YAESU FL-2100, Heathkit SB-200, or similar) and in sought-after radiant audio projects. Thanks to its extraordinary linearity and tolerance to temporary overcurrents, it ensures a clean signal, optimal efficiency, and exceptional operating stability on test benches and in the most demanding radio stations.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Side-by-side Technical Boxes - PURE WHITE BACKGROUND --\u003e\u003cdiv style=\"width: 100%; margin-bottom: 40px; position: relative; z-index: 2;\"\u003e\n\n\u003cdiv style=\"width: 47%; float: left; background-color: #ffffff; border: 1px solid #e2e8f0; padding: 20px; border-radius: 8px; border-top: 5px solid #334155; box-sizing: border-box;\"\u003e\n\n\u003ch3 style=\"color: #334155; font-size: 11px; text-transform: uppercase; margin: 0 0 8px 0; font-weight: bold; letter-spacing: 1px;\"\u003eFILAMENT VOLTAGE\u003c\/h3\u003e\n\n\u003cp style=\"font-size: 22px; font-weight: 800; color: #1e293b; margin: 0;\"\u003e6.3 Vac \/ Vdc\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv style=\"width: 47%; float: right; background-color: #ffffff; border: 1px solid #e2e8f0; padding: 20px; border-radius: 8px; border-top: 5px solid #d97706; box-sizing: border-box;\"\u003e\n\n\u003ch3 style=\"color: #d97706; font-size: 11px; text-transform: uppercase; margin: 0 0 8px 0; font-weight: bold; letter-spacing: 1px;\"\u003eMAX ANODE DISSIPATION\u003c\/h3\u003e\n\n\u003cp style=\"font-size: 22px; font-weight: 800; color: #d97706; margin: 0;\"\u003e160 W\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv style=\"clear: both;\"\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Technical Specifications Table - MINIMALIST AND TRANSPARENT STRUCTURE --\u003e\u003cdiv style=\"background-color: transparent; position: relative; z-index: 2;\"\u003e\n\n\u003ch3 style=\"color: #1e293b; font-size: 18px; margin: 0 0 15px 0; text-transform: uppercase; font-weight: 800; letter-spacing: 1px;\"\u003eReference Technical Specifications\u003c\/h3\u003e\n\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px; background-color: #ffffff; border: 1px solid #e2e8f0;\"\u003e\n\n\u003cthead\u003e\u003ctr style=\"border-bottom: 2px solid #334155; text-align: left; background-color: #f8fafc;\"\u003e\n\n\u003cth style=\"padding: 12px 10px; color: #334155; font-weight: bold;\"\u003eCharacteristic Parameter\u003c\/th\u003e\n\n\u003cth style=\"padding: 12px 10px; color: #334155; font-weight: bold;\"\u003eNominal Value \/ Limit\u003c\/th\u003e\n\n\n\u003c\/tr\u003e\u003c\/thead\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eComponent Type\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003eHigh-Mu Power Triode\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"background-color: #fbfbfc;\"\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eHeating\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003eDirect (Thoriated Tungsten Filament)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eFilament Current\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003e4.0 A\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"background-color: #fbfbfc;\"\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eAmplification Factor (µ)\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003e160\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eMaximum Anode Voltage (DC)\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003e2750 V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"background-color: #fbfbfc;\"\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eMaximum Anode Current\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003e275 mA\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eSocket \/ Base Type\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003eSuper Jumbo 4-pin (4-Pin Ceramic) with top cap (Anode)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Footer --\u003e\u003cdiv style=\"background-color: #334155; padding: 25px 5%; text-align: center; border-top: 5px solid #d97706; position: relative; z-index: 2;\"\u003e\u003cp style=\"margin: 0; color: #ffffff; font-size: 12px; letter-spacing: 2px; font-weight: bold; text-transform: uppercase;\"\u003eHamRadioShop | Technical Components and Spare Parts for Transceivers and Amplifiers\u003c\/p\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"HAMRADIOSHOP","offers":[{"title":"Default Title","offer_id":51683972022618,"sku":"572B","price":63.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0946\/2113\/9290\/files\/2540.jpg?v=1754986183"},{"product_id":"gu74b-nos-4cx800a-russian-new-tube-gu74b","title":"GU74B \/ 4CX800A Ceramic Tetrode for Acom and Alpha Amplifiers | HRS","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cdiv style=\"font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; width: 100%; max-width: 1000px; margin: 0 auto; border: 1px solid #e2e8f0; background-color: #ffffff; line-height: 1.6; position: relative; overflow: hidden; box-shadow: 0 4px 25px rgba(0,0,0,0.08);\"\u003e\n\n\u003c!-- FILIGRANA RIPOSIZIONATA PIÙ IN ALTO (top: 35%) E IN PRIMO PIANO ASSOLUTO (z-index: 99) --\u003e\n\u003cdiv style=\"position: absolute; top: 35%; left: 50%; width: 480px; height: 480px; background-image: url('https:\/\/cdn.shopify.com\/s\/files\/1\/0946\/2113\/9290\/files\/hrs_logo_new_senza_scritta.png?v=1776699756'); background-repeat: no-repeat; background-size: contain; background-position: center; opacity: 0.04; pointer-events: none; z-index: 99; transform: translate(-30%, -50%) rotate(-15deg);\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\n\u003c!-- Header - Stile Componentistica RF Avanzata (Fondo Antracite Slate \u0026 Dettaglio Cyan) --\u003e\n\u003cdiv style=\"position: relative; padding: 55px 5%; border-bottom: 8px solid #06b6d4; background-color: #1e293b; z-index: 2;\"\u003e\n\n\u003c!-- Etichetta Categoria --\u003e\n\u003cdiv style=\"position: absolute; top: 25px; right: 5%; z-index: 10;\"\u003e\n\n\u003cdiv style=\"background: #06b6d4; color: #ffffff; font-size: 11px; font-weight: 900; text-transform: uppercase; letter-spacing: 2px; padding: 8px 18px; border-radius: 3px;\"\u003eTHERMIONIC VALVES\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv style=\"position: relative; z-index: 2;\"\u003e\n\n\u003ch1 style=\"margin: 0 !important; font-size: 42px !important; text-transform: uppercase !important; letter-spacing: -1px !important; font-weight: 900 !important; line-height: 1.1 !important; color: #ffffff;\"\u003eGU74B \/ 4CX800A\u003c\/h1\u003e\n\n\u003cp style=\"margin: 15px 0 0 !important; font-size: 20px !important; color: #94a3b8; font-weight: 300 !important; text-transform: uppercase !important; letter-spacing: 3px !important;\"\u003eRussian Ceramic \/ Metal Power Tetrode NEW Tube\u003c\/p\u003e\n\n\u003cp style=\"margin: 12px 0 0 !important; font-size: 13px !important; color: #ffffff !important; font-weight: 600 !important; letter-spacing: 2px !important; text-transform: uppercase !important;\"\u003eHigh Performance NOS (New Old Stock) Component – 800W Anode Dissipation\u003c\/p\u003e\n\n\u003cdiv style=\"width: 60px; height: 4px; background: #06b6d4; margin-top: 20px; border-radius: 2px;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Contenuto --\u003e\n\u003cdiv style=\"padding: 40px 5%; position: relative; z-index: 2;\"\u003e\n\n\u003c!-- Box Caratteristiche Salienti - FONDO TRASPARENTE\/QUASI BIANCO --\u003e\n\u003cdiv style=\"margin-bottom: 35px; border-left: 4px solid #06b6d4; padding: 20px; background-color: #ecfeff; border-radius: 0 8px 8px 0; position: relative; z-index: 2;\"\u003e\n\n\u003ch2 style=\"color: #0891b2; font-size: 15px; text-transform: uppercase; letter-spacing: 2px; margin: 0 0 10px 0; font-weight: 900;\"\u003eMAXIMUM RF RELIABILITY AND LONG LIFE\u003c\/h2\u003e\n\n\u003cp style=\"color: #1e293b; font-size: 15px; margin: 0; line-height: 1.6; font-weight: 500;\"\u003e• \u003cstrong\u003eDIRECT REPLACEMENT:\u003c\/strong\u003e 100% compatible as a plug-and-play replacement for all GU74B and 4CX800A tubes used in high-end commercial linear amplifiers and home-built projects.\u003cbr\u003e\u003cbr\u003e• \u003cstrong\u003e800 WATT DISSIPATION:\u003c\/strong\u003e Thanks to its robust ceramic and metal construction, it guarantees a nominal plate dissipation index of 800W, with exceptional linearity in SSB and CW modes.\u003cbr\u003e\u003cbr\u003e• \u003cstrong\u003eTOP BRAND COMPATIBILITY:\u003c\/strong\u003e The ideal and recommended replacement for the renowned \u003cstrong\u003eACOM\u003c\/strong\u003e (1000, 1006, 1010, 2000A) and \u003cstrong\u003eALPHA\u003c\/strong\u003e (99, 91B, 8100) series amplifiers.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Descrizione Prodotto --\u003e\n\u003cdiv style=\"margin-bottom: 40px; background: transparent; position: relative; z-index: 2;\"\u003e\n\n\u003ch2 style=\"color: #1e293b; font-size: 26px; margin-bottom: 15px; border-bottom: 2px solid #e2e8f0; padding-bottom: 10px; text-transform: uppercase; letter-spacing: 1px;\"\u003ePeak Performance and Linearity\u003c\/h2\u003e\n\n\u003cp style=\"font-size: 16px; color: #475569; line-height: 1.7; text-align: justify; margin-bottom: 20px;\"\u003eThe Russian-made ceramic power tetrodes \u003cstrong\u003eGU74B \/ 4CX800A\u003c\/strong\u003e represent technological excellence in RF pre-amplification and power amplification. With an input of 1200 Watts when used as a linear power amplifier, the tube conservatively produces \u003cstrong\u003e750W PEP in SSB\u003c\/strong\u003e and \u003cstrong\u003e750 Watts Key-Down in CW\u003c\/strong\u003e. When used in modern amplifiers equipped with automatic tuning circuits, vacuum, and advanced tube protection systems, the GU74B is capable of delivering significantly higher power while ensuring a very long operating life. Its characteristics allow for optimal use both as an RF amplifier with grid amplification and in grounded grid service.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Box Tecnici Affiancati - FONDO BIANCO PURO --\u003e\n\u003cdiv style=\"width: 100%; margin-bottom: 40px; position: relative; z-index: 2;\"\u003e\n\n\u003cdiv style=\"width: 47%; float: left; background-color: #ffffff; border: 1px solid #e2e8f0; padding: 20px; border-radius: 8px; border-top: 5px solid #1e293b; box-sizing: border-box;\"\u003e\n\n\u003ch3 style=\"color: #1e293b; font-size: 11px; text-transform: uppercase; margin: 0 0 8px 0; font-weight: bold; letter-spacing: 1px;\"\u003ePLATE DISSIPATION\u003c\/h3\u003e\n\n\u003cp style=\"font-size: 22px; font-weight: 800; color: #06b6d4; margin: 0;\"\u003e800 Watt\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv style=\"width: 47%; float: right; background-color: #ffffff; border: 1px solid #e2e8f0; padding: 20px; border-radius: 8px; border-top: 5px solid #06b6d4; box-sizing: border-box;\"\u003e\n\n\u003ch3 style=\"color: #06b6d4; font-size: 11px; text-transform: uppercase; margin: 0 0 8px 0; font-weight: bold; letter-spacing: 1px;\"\u003eTECHNOLOGY\u003c\/h3\u003e\n\n\u003cp style=\"font-size: 22px; font-weight: 800; color: #1e293b; margin: 0;\"\u003eCeramic \/ Metal (NOS)\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv style=\"clear: both;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Tabella Specifiche Tecnica - STRUTTURA MINIMALISTA E TRASPARENTE --\u003e\n\u003cdiv style=\"background-color: transparent; position: relative; z-index: 2;\"\u003e\n\n\u003ch3 style=\"color: #1e293b; font-size: 18px; margin: 0 0 15px 0; text-transform: uppercase; font-weight: 800; letter-spacing: 1px;\"\u003eSpecifications and Reference Codes\u003c\/h3\u003e\n\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px; background-color: #ffffff; border: 1px solid #e2e8f0;\"\u003e\n\n\u003cthead\u003e\n\n\u003ctr style=\"border-bottom: 2px solid #1e293b; text-align: left; background-color: #f8fafc;\"\u003e\n\n\u003cth style=\"padding: 12px 10px; color: #1e293b; font-weight: bold;\"\u003eParameter \/ Identifier\u003c\/th\u003e\n\n\u003cth style=\"padding: 12px 10px; color: #1e293b; font-weight: bold;\"\u003eSales Specifications\u003c\/th\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/thead\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eManufacturer ID \/ DXE Part\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003eDXE-GU74B\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"background-color: #fbfbfc;\"\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eReplacement Type\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003eThermionic valve \/ Power amplifier tube\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eProduct Line\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003eGU74B \/ 4CX800A Ceramic Power Tetrodes\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"background-color: #fbfbfc;\"\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eConservative Output (SSB\/CW)\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003e750W PEP SSB \/ 750W Key-Down CW (with 1200W Input)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eAlpha Amplifier Compatibility\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003eAlpha 99, Alpha 91B, Alpha 8100\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"background-color: #fbfbfc;\"\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eAcom Amplifier Compatibility\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003eACOM 1000, ACOM 1006, ACOM 1010, ACOM 2000A\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003ePackage Quantity\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003eSold individually\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Footer --\u003e\n\u003cdiv style=\"background-color: #1e293b; padding: 25px 5%; text-align: center; border-top: 5px solid #06b6d4; position: relative; z-index: 2;\"\u003e\n\n\u003cp style=\"margin: 0; color: #ffffff; font-size: 12px; letter-spacing: 2px; font-weight: bold; text-transform: uppercase;\"\u003eHamRadioShop | Specialists in RF Components, Replacement Valves and Assistance\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e","brand":"HAMRADIOSHOP","offers":[{"title":"Default Title","offer_id":51684702617946,"sku":"GU74B-4CX800","price":459.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0946\/2113\/9290\/files\/12380.jpg?v=1755054214"},{"product_id":"pl-519","title":"PL519 Power Pentode Tube for HF Linear Amplifiers | HRS","description":"\u003cmeta charset=\"UTF-8\"\u003e\u003cdiv style=\"font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; width: 100%; max-width: 900px; margin: 0 auto; border: 1px solid #e2e8f0; background-color: #ffffff; line-height: 1.6; position: relative; overflow: hidden;\"\u003e\n\n\u003c!-- FILIGRANA SEMPRE IN PRIMO PIANO (z-index: 99) MA TRASPARENTE E PHANTOM --\u003e\u003cdiv style=\"position: absolute; top: 55%; left: 50%; width: 450px; height: 450px; background-image: url('https:\/\/cdn.shopify.com\/s\/files\/1\/0946\/2113\/9290\/files\/hrs_logo_new_sen_za_scritta.png?v=1776699756'); background-repeat: no-repeat; background-size: contain; background-position: center; opacity: 0.04; pointer-events: none; z-index: 99; transform: translate(-30%, -50%) rotate(-15deg);\"\u003e\u003c\/div\u003e\n\n\u003c!-- Header - Stile Componentistica \/ Valvole di Potenza (Fondo Antracite \u0026 Dettaglio Ambra) --\u003e\u003cdiv style=\"position: relative; padding: 50px 5%; border-bottom: 8px solid #d97706; background-color: #334155; z-index: 2;\"\u003e\n\n\u003c!-- Etichetta Categoria --\u003e\u003cdiv style=\"position: absolute; top: 25px; right: 5%; z-index: 10;\"\u003e\u003cdiv style=\"background: #d97706; color: #ffffff; font-size: 11px; font-weight: 900; text-transform: uppercase; letter-spacing: 2px; padding: 8px 18px; border-radius: 3px;\"\u003eTHERMIONIC VALVES\u003c\/div\u003e\u003c\/div\u003e\n\n\u003cdiv style=\"position: relative; z-index: 2;\"\u003e\n\n\u003ch1 style=\"margin: 0 !important; font-size: 36px !important; text-transform: uppercase !important; letter-spacing: -1px !important; font-weight: 900 !important; line-height: 1.1 !important; color: #ffffff;\"\u003ePL519\u003c\/h1\u003e\n\n\u003cp style=\"margin: 15px 0 0 !important; font-size: 18px !important; color: #fde68a; font-weight: 300 !important; text-transform: uppercase !important; letter-spacing: 3px !important;\"\u003ePower Pentode for Radiofrequency and HF Linear Amplifiers\u003c\/p\u003e\n\n\u003cp style=\"margin: 12px 0 0 !important; font-size: 13px !important; color: #ffffff !important; font-weight: 600 !important; letter-spacing: 2px !important; text-transform: uppercase !important;\"\u003eHigh Cathode Current – Maximum Anode Dissipation (Magnoval Equivalent)\u003c\/p\u003e\n\n\u003cdiv style=\"width: 60px; height: 4px; background: #d97706; margin-top: 20px; border-radius: 2px;\"\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Contenuto --\u003e\u003cdiv style=\"padding: 40px 5%; position: relative; z-index: 2;\"\u003e\n\n\u003c!-- Box Caratteristiche Salienti - FONDO TRASPARENTE\/QUASI BIANCO --\u003e\u003cdiv style=\"margin-bottom: 35px; border-left: 4px solid #d97706; padding: 20px; background-color: #fffbeb; border-radius: 0 8px 8px 0; position: relative; z-index: 2;\"\u003e\n\n\u003ch2 style=\"color: #b45309; font-size: 15px; text-transform: uppercase; letter-spacing: 2px; margin: 0 0 10px 0; font-weight: 900;\"\u003eROBUSTNESS AND HIGH RF PERFORMANCE\u003c\/h2\u003e\n\n\u003cp style=\"color: #1e293b; font-size: 15px; margin: 0; line-height: 1.6; font-weight: 500;\"\u003e• \u003cstrong\u003eIDEAL FOR LINEAR AMPLIFIERS:\u003c\/strong\u003e The valve of choice for repairing or building commercial HF linear amplifiers (e.g., Zetagi BV131, BV135, BV2001 MKII) thanks to its exceptional tolerance to power peaks.\u003cbr\u003e\u003cbr\u003e        • \u003cstrong\u003eREINFORCED MAGNOVAL STRUCTURE:\u003c\/strong\u003e An enhanced evolution of the PL509 model, offering greater anode heat dissipation and tolerating very high peak cathode currents.\u003cbr\u003e\u003cbr\u003e        • \u003cstrong\u003eTOP ANODE CAP:\u003c\/strong\u003e High-isolation design to safely manage high transient anode voltages.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Descrizione Prodotto --\u003e\u003cdiv style=\"margin-bottom: 40px; background: transparent; position: relative; z-index: 2;\"\u003e\n\n\u003ch2 style=\"color: #1e293b; font-size: 24px; margin-bottom: 15px; border-bottom: 2px solid #e2e8f0; padding-bottom: 10px; text-transform: uppercase; letter-spacing: 1px;\"\u003eThermionic Reliability for Radio Amateurs and Laboratories\u003c\/h2\u003e\n\n\u003cp style=\"font-size: 16px; color: #475569; line-height: 1.7; text-align: justify; margin-bottom: 20px;\"\u003eThe PL519 is an indirectly heated power pentode originally designed for the horizontal deflection stages of color televisions, but which has found its natural field of excellence in the world of radio frequency. Highly appreciated by radio amateurs and repair technicians, this valve guarantees excellent modulation linearity in the citizen's band (CB) and on decametric HF frequencies, offering an unbeatable quality\/price ratio in restoring the original power of your vintage or modern equipment and amplifiers.\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Box Tecnici Affiancati - FONDO BIANCO PURO --\u003e\u003cdiv style=\"width: 100%; margin-bottom: 40px; position: relative; z-index: 2;\"\u003e\n\n\u003cdiv style=\"width: 47%; float: left; background-color: #ffffff; border: 1px solid #e2e8f0; padding: 20px; border-radius: 8px; border-top: 5px solid #334155; box-sizing: border-box;\"\u003e\n\n\u003ch3 style=\"color: #334155; font-size: 11px; text-transform: uppercase; margin: 0 0 8px 0; font-weight: bold; letter-spacing: 1px;\"\u003eFILAMENT VOLTAGE\u003c\/h3\u003e\n\n\u003cp style=\"font-size: 22px; font-weight: 800; color: #1e293b; margin: 0;\"\u003e40 V\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv style=\"width: 47%; float: right; background-color: #ffffff; border: 1px solid #e2e8f0; padding: 20px; border-radius: 8px; border-top: 5px solid #d97706; box-sizing: border-box;\"\u003e\n\n\u003ch3 style=\"color: #d97706; font-size: 11px; text-transform: uppercase; margin: 0 0 8px 0; font-weight: bold; letter-spacing: 1px;\"\u003eMAX ANODE DISSIPATION\u003c\/h3\u003e\n\n\u003cp style=\"font-size: 22px; font-weight: 800; color: #d97706; margin: 0;\"\u003e35 W (Continuous)\u003c\/p\u003e\n\n\n\u003c\/div\u003e\n\n\u003cdiv style=\"clear: both;\"\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Tabella Specifiche Tecnica - STRUTTURA MINIMALISTA E TRASPARENTE --\u003e\u003cdiv style=\"background-color: transparent; position: relative; z-index: 2;\"\u003e\n\n\u003ch3 style=\"color: #1e293b; font-size: 18px; margin: 0 0 15px 0; text-transform: uppercase; font-weight: 800; letter-spacing: 1px;\"\u003eReference Technical Specifications\u003c\/h3\u003e\n\n\u003ctable style=\"width: 100%; border-collapse: collapse; font-size: 14px; background-color: #ffffff; border: 1px solid #e2e8f0;\"\u003e\n\n\u003cthead\u003e\u003ctr style=\"border-bottom: 2px solid #334155; text-align: left; background-color: #f8fafc;\"\u003e\n\n\u003cth style=\"padding: 12px 10px; color: #334155; font-weight: bold;\"\u003ePhysical \/ Electronic Parameter\u003c\/th\u003e\n\n\u003cth style=\"padding: 12px 10px; color: #334155; font-weight: bold;\"\u003eRated Value\u003c\/th\u003e\n\n\n\u003c\/tr\u003e\u003c\/thead\u003e\n\n\u003ctbody\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eValve Type\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003eIndirectly heated power pentode\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"background-color: #fbfbfc;\"\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eFilament Current (If)\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003e0.3 A (300 mA)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eNominal Anode Voltage (Va)\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003eUp to 250V (DC) — Max impulsive peaks 7000V\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"background-color: #fbfbfc;\"\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003ePeak Cathode Current (Ik max)\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003e1.5 A (1500 mA)\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eGrid 2 Dissipation (Pg2)\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003e7 W max\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\u003ctr style=\"background-color: #fbfbfc;\"\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #1e293b; font-weight: bold; border-bottom: 1px solid #e2e8f0;\"\u003eSocket \/ Base\u003c\/td\u003e\n\n\u003ctd style=\"padding: 12px 10px; color: #475569; border-bottom: 1px solid #e2e8f0;\"\u003e9-pin Magnoval (B9D) with top anode connection\u003c\/td\u003e\n\n\n\u003c\/tr\u003e\n\n\n\u003c\/tbody\u003e\n\n\n\u003c\/table\u003e\n\n\n\u003c\/div\u003e\n\n\n\u003c\/div\u003e\n\n\u003c!-- Footer --\u003e\u003cdiv style=\"background-color: #334155; padding: 25px 5%; text-align: center; border-top: 5px solid #d97706; position: relative; z-index: 2;\"\u003e\u003cp style=\"margin: 0; color: #ffffff; font-size: 12px; letter-spacing: 2px; font-weight: bold; text-transform: uppercase;\"\u003eHamRadioShop | Components and Replacement Valves for RF Amplifiers\u003c\/p\u003e\u003c\/div\u003e\n\n\n\u003c\/div\u003e\u003cp\u003e \u003c\/p\u003e","brand":"HAMRADIOSHOP","offers":[{"title":"Default Title","offer_id":54212311581018,"sku":"PL519","price":75.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0946\/2113\/9290\/files\/IMG_9956.jpg?v=1780073038"}],"url":"https:\/\/hamradioshop.it\/en\/collections\/valvole-1.oembed","provider":"HAMRADIOSHOP","version":"1.0","type":"link"}