Preamp Tubes

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Author Message glocke Senior Member Username: glocke Post Number: 614 Registered: 9-2002 Posted on Friday, July 31, 2009 - 6:55 am:    I need to replace the preamp tubes in my demeter preamp. I know next to nothing about tubes, but have heard that there are differences between various tube manufacturers. Any suggestions as to what to try? The original tubes there were in there were Electro Harmonix 12AX7's. I actually found the demeter to be a little to much on the bright and middy side with these in. Is it possible that switching the tube type would mellow out the tone a little bit? gtrguy Advanced Member Username: gtrguy Post Number: 239 Registered: 9-2004 Posted on Friday, July 31, 2009 - 7:33 am:    JJ's make all around great tubes! This thread will likely go on forever, as there are so many tubes folks like. xlrogue6 Intermediate Member Username: xlrogue6 Post Number: 151 Registered: 8-2002 Posted on Friday, July 31, 2009 - 9:00 am:    The TungSol and Mullard reissues would also be a good choice. Like the JJ's, they're a bit less bright than the EH's. If you're buying JJ's, I highly recommend buying them from a Ruby Tubes dealer in the HG+ version. Ruby tests the JJ's and selects the ones with the highest gain and lowest microphonics to sell as the 12AX7HG+. I've had great luck with them--they're well worth the couple of extra bucks. hydrargyrum Senior Member Username: hydrargyrum Post Number: 635 Registered: 3-2004 Posted on Friday, July 31, 2009 - 11:12 am:    I can't speak highly enough of http://www.eurotubes.com/. I've bought I couple of sets from him, and he always appeared to be quite knowledgeable about the various options. He also sell's JJ's. slawie Member Username: slawie Post Number: 92 Registered: 8-2002 Posted on Sunday, August 02, 2009 - 2:29 am:    Why not make your own? Part one http://www.youtube.com/watch?v=gl-QMuUQhVM&feature=PlayList&p=09DA75E1E00B12A0&playnext=1&playnext_from=PL&index=3 Part 2 http://www.youtube.com/watch?v=9S5OwqOXen8&feature=PlayList&p=09DA75E1E00B12A0&index=4 slawie crobbins Senior Member Username: crobbins Post Number: 417 Registered: 6-2004 Posted on Sunday, August 02, 2009 - 9:44 am:    I buy my tubes through Mesa-Boogie. http://mesa.stores.yahoo.net/mesboogtub.html glocke Senior Member Username: glocke Post Number: 621 Registered: 9-2002 Posted on Thursday, August 06, 2009 - 3:04 pm:    Well, I got a couple of JJ's from Eurotubes and put them in my Demeter, boy what a difference. The highs are much smoother and not as brittle and harsh as the highs with the EH tubes, and the mids seem to be smoothed out a tad bit also. thanks for the tip!! mica Moderator Username: mica Post Number: 6291 Registered: 6-2000 Posted on Thursday, August 06, 2009 - 3:40 pm:    The JJ 12AX7/ECC83 are the tubes we're using now - mainly because they almost always fit in the shielding sleeve. hydrargyrum Senior Member Username: hydrargyrum Post Number: 643 Registered: 3-2004 Posted on Friday, August 07, 2009 - 8:04 am:    Cool! I'm glad they worked out for you.