Members sgt_politeness Posted August 3, 2006 Members Share Posted August 3, 2006 I just picked up a set of JJ 6L6s to replace the GTs that are in my Music Man HD150. Will i need to get the bias set on this? Can i tell anything by the number written on the sticker on the base of the tubes? Link to comment Share on other sites More sharing options...
Members fretless Posted August 3, 2006 Members Share Posted August 3, 2006 yes , always a good idea Also a good idea to check it again and again after days/months/years of use as they change with use .Ask your tech to teach you , hopefully the amp has a bias pot or it can be added and there are cool things like the Bias king and https://weberspeakerscom.secure.powweb.com/biasrite/br_page.htm to make it easier. But don't mess with it if you don't know what you are doing , as to avoid a killer shock . I would check the #'s again after you bias it , they may or may not be the same in your amp , but it helps to place them so as to put the best match 2 stronger and 2 weaker together to get the most even push/pull also helps if you take them out later to put them back where you got them or you may need to recheck the bias , the bias rite is super easy to use so have your tech teach you so you can maintain it over the years yourself . Link to comment Share on other sites More sharing options...
Members Markee Posted August 3, 2006 Members Share Posted August 3, 2006 Even matched pairs, if you stick them on a tester, often are off a bit. Unless your amp is self biasing you need to have them biased to get optimum tone and longevity out of them. www.webervst.com sells a Bias Right that makes biasing a snap and pays for itself in a couple of tube changes. Link to comment Share on other sites More sharing options...
Members misterhinkydink Posted August 3, 2006 Members Share Posted August 3, 2006 I wouldn't sweat it. Going from one brand of 6L6 to another isn't going to make that much difference. Link to comment Share on other sites More sharing options...
Members der oxenrig Posted August 3, 2006 Members Share Posted August 3, 2006 Originally posted by misterhinkydink I wouldn't sweat it. Going from one brand of 6L6 to another isn't going to make that much difference. Oh yes it will. Especially in that amp. Squeezing 150 watts out of 4 6L6s? That'd melt most crappy tubes. He NEEDS to get that amp biased, or else something serious could go very wrong. Link to comment Share on other sites More sharing options...
Members misterhinkydink Posted August 3, 2006 Members Share Posted August 3, 2006 Originally posted by The Ox Oh yes it will. Especially in that amp. Squeezing 150 watts out of 4 6L6s? That'd melt most crappy tubes. He NEEDS to get that amp biased, or else something serious could go very wrong. You don't know what you're talking about. Link to comment Share on other sites More sharing options...
Members der oxenrig Posted August 3, 2006 Members Share Posted August 3, 2006 Originally posted by misterhinkydink You don't know what you're talking about. Don't get me started. I owned a Music Man HD130. Same amp, but with EL34s. These amps put 700+ volts on the plates, whereas most other amps do 400-500. Not only does he need to get it biased, he needs to use a very robust tube, like the JJs. Link to comment Share on other sites More sharing options...
Members misterhinkydink Posted August 3, 2006 Members Share Posted August 3, 2006 Originally posted by The Ox Don't get me started. I owned a Music Man HD130. Same amp, but with EL34s. These amps put 700+ volts on the plates, whereas most other amps do 400-500. Not only does he need to get it biased, he needs to use a very robust tube, like the JJs. He is using JJs which are more like a 7027a. He won't have a problem. Link to comment Share on other sites More sharing options...
Members der oxenrig Posted August 3, 2006 Members Share Posted August 3, 2006 Originally posted by misterhinkydink He is using JJs which are more like a 7027a. He won't have a problem. He should still get it biased. Link to comment Share on other sites More sharing options...
Members ryanstanley Posted August 3, 2006 Members Share Posted August 3, 2006 dont listen to that guy get it biased its the smart thing to do, whether its absolutely necessary or not Link to comment Share on other sites More sharing options...
Members 72Rick Posted August 3, 2006 Members Share Posted August 3, 2006 Originally posted by fretless yes , always a good idea Bias king and https://weberspeakerscom.secure.powweb.com/biasrite/br_page.htm to make it easier. Thanks allot fretless! Those look awesome. Nice, easy tool to use to get the job done right. Link to comment Share on other sites More sharing options...
Members Thumper Posted August 3, 2006 Members Share Posted August 3, 2006 I'd get a Bias King and bias the tubes. It's not cheap, but neither are replacement tubes---or a new amp. 'Course, it's a cool tool and it looks like it would be fun to play with. Link to comment Share on other sites More sharing options...
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