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Questions about tubes and gear that glows. FAQ

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RE: 6SL7

Posted by Eli Duttman on April 12, 2017 at 09:11:19:
Consider making adapters from Loctal sockets and Octal plugs, to hold 7F7s. The 7F7 is electrically equivalent to the 6SL7. Forget about branding, Loctal tubes were made by Sylvania at Emporium, PA. In any given time frame, Sylvania used the same "cages" in both 6SL7s and 7N7s. However, Loctal tubes have glass button bases, like the 7 and 9 pin mini types, and they were intended for mobile service, with the associated vibration.