No they are not, they are identical electrically but have a different pinout. You will need an adapter you can find them on Ebay!!!I assume the 6F8G's are a direct plug-in replacement for 6SN7's?
Glad you decided to try them, like I said before they will be hard to best!!! Years ago when I got into them they were $25 a pair word got out and now they cost alot more, still cheaper than the Tung Sol Round Plates even though they are the same tube just in a different glass envelope!!!I ordered a NOS pair of Tung Sol 6F8G's and had them in my system for a few weeks now. BIG overall difference in sound quality. Bass cleaner and tighter. I have to agree with jcmusic's listening impressions of them in the ModWright 105. NOT cheap for those that may be interested
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