unclej Posted November 29, 2004 Report Share Posted November 29, 2004 i recently acquired a superior instruments co. tc-55 tube tester. i also have an ampec gemini-II tube amp. two of the tubes in the gemini are phillips 7591's. the tube chart that came with the tester was printed in 1956 and doesn't list the 7591. is there a conversion chart that might give me an equivilant tube number from back then that would test the same as the 7591? there is a socket on the tester that the 7591 will fit. Quote Link to comment Share on other sites More sharing options...
Southpa Posted November 29, 2004 Report Share Posted November 29, 2004 (edited) It doesn't show up on my Jackson-49 either. Then again, my machine is from the same era as yours. Got it at a garage sale for 5 bucks! But here is a little help. http://www.vacuumtubesinc.com/info.html Unfortunately, the 2 "alternates" mentioned (7868 & 6GM5), aren't on my machine either and likely won't be on yours. But its good to know what else would work. I guess you should just take them to someone w/ more modern equipment, . Edited November 29, 2004 by Southpa Quote Link to comment Share on other sites More sharing options...
unclej Posted November 29, 2004 Author Report Share Posted November 29, 2004 i didn't give much more than that for mine. maybe we're being punished by the tube gods for being cheap. those alternatives aren't on my list either but thanks for the link. Quote Link to comment Share on other sites More sharing options...
Paul Marossy Posted November 29, 2004 Report Share Posted November 29, 2004 I'm not sure that there is an equivalent for that tube. It seems that a 6L6GC or a 5881 is closest to the tube in terms of performance. However, the pinouts are different from the 7591 according to this page: http://www.triodeel.com/7591.htm I would try to do a search for the owners manual on that tube tester. If you can find that, then you may be able to get an updated tube list from that same source. That's what I did with my EICO tube tester. Good luck! Quote Link to comment Share on other sites More sharing options...
Southpa Posted November 30, 2004 Report Share Posted November 30, 2004 (edited) And here is the base diagram for the 7591, . http://www.nostalgiaair.org/tubes/7591.htm Edited November 30, 2004 by Southpa Quote Link to comment Share on other sites More sharing options...
unclej Posted November 30, 2004 Author Report Share Posted November 30, 2004 thanks all. Quote Link to comment Share on other sites More sharing options...
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