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How do you bias a Peavey 6505 plus?

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  • How do you bias a Peavey 6505 plus?

    My fellow guitarist has a Peavey 6505 plus with two 6l6 in the middle and two KT66 at the both ends of the power tubes section. Can I just take a multimeter and plug it in through the back and read it off of there? I did that and received a reading of about 56. The guy at eurotubes told him that the back of the amp where you put in the test points are useless and that he would need a bias probe, what ever that means. We're really confused and need your help.
    Framus Cobra Top
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    Ibanez S520EX W/EMG81 & EMG60

    Check out my Metalcore band at www.myspace.com/LegionOfTheSonne

  • #2
    Gibson|PRS|Mesa Boogie
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    • #3


      This
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      • #4
        get a bias probe. This question is asked every day here.
        EVERYTHING LOUDER THAN EVERYTHING ELSE



        ebmm axis-fortin cali/metro plexi 50-soldano hot rod 50-5150-5152-jcm 900 mk3
        good deals:zakko,hmkrich,jonnytoetags,muzikazoo

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        • #5
          I'm probably wrong, but you have to modify the amp to have a bias control added.

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          Originally Posted by thegumbootman


          I managed to not say the word "****************" until I was 18

          In primary school when my friends discovered swearing, I thought "I've never said the f-word before. I'm never going to say it". I wanted to say it when I got older (mostly because my friends would nag me about saying it), but I just didn't want to end the streak of not-saying it

          I ended up accidentally saying it to my girlfriend at the time. I said "Someone told me that Ben got with a really fat girl and he titty-****************ed her"

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          • #6
            Tech.
            Originally Posted by Shine


            :vaginapalm:









            Originally Posted by NITROHOLIC


            Tawlks you sir need a bong hit.









            Originally Posted by TornadoOfSouls


            There's something wrong with guns, alcohol and drugs??

            What are you? Gay?



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            • #7
              You don't need a tech. It is dead simple to bias a amp.
              All the info you need is easily found on the net.
              EVERYTHING LOUDER THAN EVERYTHING ELSE



              ebmm axis-fortin cali/metro plexi 50-soldano hot rod 50-5150-5152-jcm 900 mk3
              good deals:zakko,hmkrich,jonnytoetags,muzikazoo

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              • #8
                get a bias probe. This question is asked every day here.

                Would something like this be good? : http://taweber.powweb.com/biasrite/br_page.htm
                Framus Cobra Top
                VHT Deliverance cabinet
                G-Major Multi-effects processor
                MXR 10-band EQ pedal
                Ibanez S520EX W/EMG81 & EMG60

                Check out my Metalcore band at www.myspace.com/LegionOfTheSonne

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                • #9
                  That will work great. On the 6505 plus you may have to swap a resistor if you cannot get in the range you want.

                  Actually I would just replace the 12k with a 6.8k while I had the amp opened up.
                  EVERYTHING LOUDER THAN EVERYTHING ELSE



                  ebmm axis-fortin cali/metro plexi 50-soldano hot rod 50-5150-5152-jcm 900 mk3
                  good deals:zakko,hmkrich,jonnytoetags,muzikazoo

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                  • #10
                    Hey, so what's the purpose for the test points at the rear of the amp?
                    Framus Cobra Top
                    VHT Deliverance cabinet
                    G-Major Multi-effects processor
                    MXR 10-band EQ pedal
                    Ibanez S520EX W/EMG81 & EMG60

                    Check out my Metalcore band at www.myspace.com/LegionOfTheSonne

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                    • #11
                      I think they measure grid current.
                      EVERYTHING LOUDER THAN EVERYTHING ELSE



                      ebmm axis-fortin cali/metro plexi 50-soldano hot rod 50-5150-5152-jcm 900 mk3
                      good deals:zakko,hmkrich,jonnytoetags,muzikazoo

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                      • #12
                        That will work great. On the 6505 plus you may have to swap a resistor if you cannot get in the range you want.

                        Actually I would just replace the 12k with a 6.8k while I had the amp opened up.


                        I am going to go out on a limb and say about that to 99.9% of HC what you just said might as well be Japanese.
                        Gibson|PRS|Mesa Boogie
                        100+ Good Deals/Transactions between Harmony Central, Rig-Talk, and The Gear Page

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                        • #13
                          i dont think those bais test points are for adjusting the bais, I wouldnt leave those KT66 in there, unless you want a blown amp

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                          • #14
                            I thought kt66 and 6l6 were interchangeable. Maybe not.
                            EVERYTHING LOUDER THAN EVERYTHING ELSE



                            ebmm axis-fortin cali/metro plexi 50-soldano hot rod 50-5150-5152-jcm 900 mk3
                            good deals:zakko,hmkrich,jonnytoetags,muzikazoo

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                            • #15
                              You can't bias a 6505 unless its modded, right?
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                              Originally Posted by eudaimonia02912


                              I am going to print this out, and next time I take a ****************, wipe my ass with it.









                              Originally Posted by Ovid9


                              I DO like football. All those guys in tight pants. And names like "tight end" and "wide receiver" its FAAAAAAAABulous.

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