Members dgc480 Posted October 9, 2010 Members Share Posted October 9, 2010 Hey, I have a Carvin MTS3200 which I put new Svetlana Winged C 6L6GCs, and Ruby Tubes 12AX7AC7 HG + tubes in. However, I want to sell my MTS, but I want to keep my new tubes, so I need to put the factory set back in. The problem is, I can't remember if I took this to someone to get him to rebias the amp to install the new tubes, or if I just stuck them in there. Would I have needed to rebias to put the new set in there? Even if I can't remember, could I just stick the old set back in there? I know that I've played around with tube variations, and to see if I could tell the difference by switching the nw and old tubes in and out, and the amp sounded fine. Thanks, Dylan Link to comment Share on other sites More sharing options...
Members NinjaRaf Posted October 9, 2010 Members Share Posted October 9, 2010 You would likely be ok without rebiasing, but its always a good idea to do so. You can do it yourself if you pick up a bias probe and a multimeter...would save you a bunch of money over taking it to some one. Link to comment Share on other sites More sharing options...
Members oryan Posted October 9, 2010 Members Share Posted October 9, 2010 Good idea selling the MTS. I owned that amp for a total of 3 days. Link to comment Share on other sites More sharing options...
Members dgc480 Posted October 9, 2010 Author Members Share Posted October 9, 2010 haha yea. I want to get a fender hot rod deluxe, and put my new tubes in it. I know it's not a boutique, but it's definitely a step up in my opinion. I thought the cleans were really nice and snappy. And the distortion is surprisingly good. Anyways, not to change the subject. I'm not sure, but I think the MTS may have a fixed bias. It has a switch on the back for EL34 and 6L6, so if I put in on the 6L6, would that mean I can just swap out my new 6L6GCs for the old Sovtec 5881 no problem? Link to comment Share on other sites More sharing options...
Members NinjaRaf Posted October 9, 2010 Members Share Posted October 9, 2010 Good idea selling the MTS. I owned that amp for a total of 3 days. I had mine for about a year, and I got some great tones out of it. LIked it more than my deliverance. Link to comment Share on other sites More sharing options...
Members NinjaRaf Posted October 9, 2010 Members Share Posted October 9, 2010 haha yea. I want to get a fender hot rod deluxe, and put my new tubes in it. I know it's not a boutique, but it's definitely a step up in my opinion. I thought the cleans were really nice and snappy. And the distortion is surprisingly good.Anyways, not to change the subject. I'm not sure, but I think the MTS may have a fixed bias. It has a switch on the back for EL34 and 6L6, so if I put in on the 6L6, would that mean I can just swap out my new 6L6GCs for the old Sovtec 5881 no problem? The bias isnt fixed...theres a pot inside the amp, I think its blue, that you would have to turn to adjust the bias. Link to comment Share on other sites More sharing options...
Members Sixtonoize Posted October 9, 2010 Members Share Posted October 9, 2010 It is fixed bias, it's just adjustable.Pretty much every modern (class A/B) amp in the world is fixed bias - that means that the idle conditions are set by a constant voltage. Amps like Mesas and Peaveys are non-adjustable fixed bias, meaning that there isn't a way to adjust that voltage to compensate for different tubes. Amps like Marshalls or the Carvin in question have adjustable fixed bias, meaning you can dial your amp to be optimized for whatever tube set is installed. Link to comment Share on other sites More sharing options...
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