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The 7581 had slightly larger glass envelope (1-9/16-inch dia.) than did the earlier 6L6WGB (1-7/16-inch dia.), thus providing more surface area from which to dissipate heat from plate; however, no effect or change to screen dissipation.
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Last edited by Old Tele man; 07-22-2018, 03:23 PM....and the Devil said: "...yes, but it's a DRY heat!"
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