{"product_id":"rare-6sn7gt-vt229-raytheon-black-plate-military-tubes","title":"SOLD - RARE 6SN7GT \/ VT-231 Raytheon Black Plate Military Tubes","description":"\u003ch3\u003e\u003cspan style=\"color: rgb(43, 0, 255);\"\u003e\u003cem\u003e\u003cstrong\u003eYou will revive the exact tubes pictured in the photo.\u003c\/strong\u003e\u003c\/em\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2 data-start=\"451\" data-end=\"482\"\u003e🏭 Manufacturer Authenticity\u003c\/h2\u003e\n\u003cp data-start=\"484\" data-end=\"543\"\u003eThe construction screams \u003cstrong data-start=\"509\" data-end=\"542\"\u003etrue Raytheon U.S. production\u003c\/strong\u003e:\u003c\/p\u003e\n\u003ch3 data-start=\"545\" data-end=\"564\"\u003ePlate Structure\u003c\/h3\u003e\n\u003cul data-start=\"565\" data-end=\"699\"\u003e\n\u003cli data-start=\"565\" data-end=\"590\"\u003e\n\u003cp data-start=\"567\" data-end=\"590\"\u003eThick long black plates\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"591\" data-end=\"640\"\u003e\n\u003cp data-start=\"593\" data-end=\"640\"\u003eSmooth plate surface (not ribbed like Sylvania)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"641\" data-end=\"671\"\u003e\n\u003cp data-start=\"643\" data-end=\"671\"\u003eSlightly rounded plate edges\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"672\" data-end=\"699\"\u003e\n\u003cp data-start=\"674\" data-end=\"699\"\u003eClean rectangular cutouts\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"701\" data-end=\"723\"\u003eClassic Raytheon look.\u003c\/p\u003e\n\u003chr data-start=\"725\" data-end=\"728\"\u003e\n\u003ch2 data-start=\"730\" data-end=\"751\"\u003e⚓ UTS Anchor Stamp\u003c\/h2\u003e\n\u003cp data-start=\"753\" data-end=\"790\"\u003eThe anchor + “UTS” marking indicates:\u003c\/p\u003e\n\u003cul data-start=\"792\" data-end=\"871\"\u003e\n\u003cli data-start=\"792\" data-end=\"823\"\u003e\n\u003cp data-start=\"794\" data-end=\"823\"\u003eU.S. Navy contract production\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"824\" data-end=\"851\"\u003e\n\u003cp data-start=\"826\" data-end=\"851\"\u003eLikely early-to-mid 1950s\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"852\" data-end=\"871\"\u003e\n\u003cp data-start=\"854\" data-end=\"871\"\u003eMilitary screened\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"873\" data-end=\"913\"\u003eThat’s a positive sign — not a red flag.\u003c\/p\u003e\n\u003chr data-start=\"915\" data-end=\"918\"\u003e\n\u003ch2 data-start=\"920\" data-end=\"948\"\u003e🔬 Internal Build Quality\u003c\/h2\u003e\n\u003cp data-start=\"950\" data-end=\"961\"\u003eThese show:\u003c\/p\u003e\n\u003cul data-start=\"963\" data-end=\"1092\"\u003e\n\u003cli data-start=\"963\" data-end=\"983\"\u003e\n\u003cp data-start=\"965\" data-end=\"983\"\u003eHeavy support rods\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"984\" data-end=\"1004\"\u003e\n\u003cp data-start=\"986\" data-end=\"1004\"\u003eTight mica spacing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1005\" data-end=\"1025\"\u003e\n\u003cp data-start=\"1007\" data-end=\"1025\"\u003eClean getter flash\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1026\" data-end=\"1052\"\u003e\n\u003cp data-start=\"1028\" data-end=\"1052\"\u003eNo obvious plate warping\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1053\" data-end=\"1092\"\u003e\n\u003cp data-start=\"1055\" data-end=\"1092\"\u003eStrong vacuum (flashing looks intact)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1094\" data-end=\"1125\"\u003eThey look healthy structurally.\u003c\/p\u003e\n\u003chr data-start=\"1127\" data-end=\"1130\"\u003e\n\u003ch2 data-start=\"1132\" data-end=\"1153\"\u003e🧠 Dating Estimate\u003c\/h2\u003e\n\u003cp data-start=\"1155\" data-end=\"1164\"\u003eBased on:\u003c\/p\u003e\n\u003cul data-start=\"1166\" data-end=\"1233\"\u003e\n\u003cli data-start=\"1166\" data-end=\"1178\"\u003e\n\u003cp data-start=\"1168\" data-end=\"1178\"\u003eBlack base\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1179\" data-end=\"1198\"\u003e\n\u003cp data-start=\"1181\" data-end=\"1198\"\u003eLong black plates\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1199\" data-end=\"1218\"\u003e\n\u003cp data-start=\"1201\" data-end=\"1218\"\u003eMilitary labeling\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1219\" data-end=\"1233\"\u003e\n\u003cp data-start=\"1221\" data-end=\"1233\"\u003eGetter style\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1235\" data-end=\"1302\"\u003eI’d place these roughly \u003cstrong data-start=\"1259\" data-end=\"1301\"\u003eearly to mid 1950s Raytheon production\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"1304\" data-end=\"1391\"\u003eThese are not late 60s consumer tubes.\u003cbr\u003eThese are real deal mid-century military pieces.\u003c\/p\u003e\n\u003chr data-start=\"1393\" data-end=\"1396\"\u003e\n\u003ch2 data-start=\"1398\" data-end=\"1449\"\u003e🎵 Sonic Character (Classic Raytheon Long Plate)\u003c\/h2\u003e\n\u003cp data-start=\"1451\" data-end=\"1479\"\u003eIf they test strong, expect:\u003c\/p\u003e\n\u003cul data-start=\"1481\" data-end=\"1605\"\u003e\n\u003cli data-start=\"1481\" data-end=\"1507\"\u003e\n\u003cp data-start=\"1483\" data-end=\"1507\"\u003eBig dimensional midrange\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1508\" data-end=\"1523\"\u003e\n\u003cp data-start=\"1510\" data-end=\"1523\"\u003eSlight warmth\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1524\" data-end=\"1542\"\u003e\n\u003cp data-start=\"1526\" data-end=\"1542\"\u003eGood bass weight\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1543\" data-end=\"1581\"\u003e\n\u003cp data-start=\"1545\" data-end=\"1581\"\u003eSmooth but not overly bright top end\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1582\" data-end=\"1605\"\u003e\n\u003cp data-start=\"1584\" data-end=\"1605\"\u003eStrong center imaging\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1607\" data-end=\"1645\"\u003eRaytheon long black plates often have:\u003c\/p\u003e\n\u003cul data-start=\"1647\" data-end=\"1792\"\u003e\n\u003cli data-start=\"1647\" data-end=\"1688\"\u003e\n\u003cp data-start=\"1649\" data-end=\"1688\"\u003eA slightly “bold American” presentation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1689\" data-end=\"1715\"\u003e\n\u003cp data-start=\"1691\" data-end=\"1715\"\u003eMore punch than Sylvania\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1716\" data-end=\"1748\"\u003e\n\u003cp data-start=\"1718\" data-end=\"1748\"\u003eMore drive than RCA grey glass\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1749\" data-end=\"1792\"\u003e\n\u003cp data-start=\"1751\" data-end=\"1792\"\u003eNot as lush as early Tung-Sol round plate\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1794\" data-end=\"1849\"\u003eThey can sound very authoritative in the right circuit.\u003c\/p\u003e\n\u003chr data-start=\"1851\" data-end=\"1854\"\u003e","brand":"Bespoke Audio Shop","offers":[{"title":"Default Title","offer_id":53328115892590,"sku":"BSA-31","price":289.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0977\/2721\/8030\/files\/IMG_2234.jpg?v=1772037657","url":"https:\/\/bespoke-audio-shop.myshopify.com\/products\/rare-6sn7gt-vt229-raytheon-black-plate-military-tubes","provider":"Bespoke Audio Shop","version":"1.0","type":"link"}