{"product_id":"marshall-jtm50-hocking04102026","title":"1967 Marshall JTM 50 \"Black Flag\" Plexi | Original Drake 784-128 \u0026 Vintage Tesla Blue Glass EL34s","description":"\u003cp\u003e\u003cb\u003eThe Holy Grail of Transitional Plexis: The 1967 Marshall JTM 50\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003eThis is a rare opportunity to own a \"time-capsule\" piece of rock history. This 1967 Marshall JTM 50 features the iconic and highly coveted \"Black Flag\" J.T.M. faceplate—a hallmark of the brief transitional period between the JTM 45 and the JMP 50.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eInvestment-Grade Originality\u003c\/b\u003e\u003c\/p\u003e\u003cp\u003eUnlike many vintage Marshalls that have been modified or \"parted out\" over the decades, this chassis remains in exceptionally honest, original condition.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eTransformers: \u003c\/b\u003eFeatures the legendary Drake 784-128 Output Transformer, the definitive source of the mid-60s Marshall \"growl.\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCircuitry: \u003c\/b\u003eThe board is populated with original Mullard \"Mustard\" capacitors and a period-correct TCC Electropack filter cap.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eThe Tubes: \u003c\/b\u003eEquipped with a matched pair of rare, vintage Tesla \"Blue Glass\" EL34s (Roznov factory). These tubes are world-renowned for their aggressive harmonic content and durability.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eCondition Report\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eFaceplate: \u003c\/b\u003eOriginal gold Plexiglas \"Black Flag\" panel with authentic age-related patina.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eChassis: \u003c\/b\u003eClean, with original hardware and \"untouched\" solder joints on the main board.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTone: \u003c\/b\u003eThis is the \"Plexi\" sound—thick, touch-sensitive, and harmonically rich.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003ePrevious Owner\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\u003cli\u003e\n\u003cb\u003eEdgar Winter's Lead Guitarist: \u003c\/b\u003eThis amp was purchased for gigs with the Edgar Winter band in the early to mid 90s.\u003c\/li\u003e\u003c\/ul\u003e\u003cp\u003e\u003cb style=\"font-size: 0.875rem;\"\u003eTechnical Specifications\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eYear:\u003c\/b\u003e 1967\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eModel:\u003c\/b\u003e JTM 50 (Transitional)\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFaceplate:\u003c\/b\u003e Original Plexiglas \"Black Flag\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eOutput Transformer:\u003c\/b\u003e Drake 784-128 (Original)CapacitorsMullard Mustard (Original)\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePower Tubes:\u003c\/b\u003e Vintage Tesla EL34 (Blue\/Purple Glass)\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eGeneral Information\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSerial Number: \u003c\/b\u003e10550\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eModel: \u003c\/b\u003eJTM50\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCondition:\u003c\/b\u003e Very Good\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eManufactured Date:\u003c\/b\u003e 1967\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eManufactured Location: \u003c\/b\u003eEngland\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cb\u003eCondition Notes\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eThe \"Mid\" knob is very stiff and hard to turn\u003c\/li\u003e\n\u003cli\u003ePresence \u0026amp; Mid knob likely have been replaced\u003c\/li\u003e\n\u003cli\u003eThe power indicator light seems to be new\u003c\/li\u003e\n\u003cli\u003eThere is a small crack in the faceplate near the power indicator light\u003c\/li\u003e\n\u003cli\u003eAn internal bias control added\u003c\/li\u003e\n\u003cli\u003eStandby switch is a bit finicky and likely needs cleaned\u003c\/li\u003e\n\u003cli\u003eScreen resistors have been replaced\u003c\/li\u003e\n\u003cli\u003eAn IEC has been added BUT no modifications have been made. The original Bulgin socket is included\u003c\/li\u003e\n\u003cli\u003eRoad case is included\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Marshall","offers":[{"title":"Default Title","offer_id":48397541146879,"sku":"Marshall JTM50 -hocking04102026","price":17999.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1110\/3544\/files\/medium_94bb46ee-d19f-4c6b-85c4-744715f07a5c.jpg?v=1776197869","url":"https:\/\/www.cottonwoodmusicemporium.com\/products\/marshall-jtm50-hocking04102026","provider":"Cottonwood Music Emporium","version":"1.0","type":"link"}