mopardave Posted January 17, 2019 Share Posted January 17, 2019 Just did an A B A B with these tubes. The black glass 12sx7 had some old rave reviews compared to the 12sn7 clear glass. Found the black glass on Ebay, 1947 vintage I believe. Hands down the 12sn7GT was cleaner and more revealing in my Maple Tree pre with the Audcom and Super Heresy. Just my opinion, don't care for these 12sx7GT's. Quote Link to comment Share on other sites More sharing options...
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