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KT-66/7581
7581/A это промышленная версия 6L6GC.
В Великобритании лампы этой версии выпускались под названием KT-66.
The ratings 7581 are roughly the same as the 6L6GC while the 7581A has higher ratings. The 7581 has a plate voltage rating of 500 V--35 watts (5 watts more than the 6L6GC) and a screen rating of 450V--5 watts.
7581 TungSol
7581A GE Early Version With Flesh Colored Base
7581A GE Later Version With Black Base
7581A RCA Brand Made By GE
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