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Fender 112SE BIAS setting

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  • #31
    Yes , i have removed bulb limiter and the signal is good with 2R2 resistor .
    going play amp for hear the sound ,

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    • #32
      Originally posted by Feufeu View Post
      - with amp on Bulb limiter i have put my decade box between CR13 & CR14 et up slowly résistors values, with 34R i have à good signal without distortion ...

      -> Throught .047R now i have 6.6mV and have 1.21 & 1.19 on TIP base.

      do you thinks is good setting for this transistors ? or is dangerous setting ?
      You did an edit as I was writing the previous post.

      I think I would want to recheck the current without the limiter just in case it goes too high when the limiter is removed.

      Edit: Right, I see you've done that already

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      • #33
        Haaaaa sound si more good with 2R2 , but juste again little distortion , i do remake restitor test with my decade for up to 10mV.

        -> Without bulblimiter and 45Vdc on TIP's collector

        So with 22R resistor i have 9.5mV throught 0.47R ( mesure take on R96 ) and crossover distortion have Disappeared

        OMG GREAT SOUND !!!!!

        ------------------> For this amp after TIP's remplacement it is necessary to recal BIAS with resistor arround 22R put between CR13 & CR14, and play it loud <--------------

        Last question, when i turn off amplifier have big PoP in speaker, Someone to a trick to limit this PoP ???????

        Once again, sorry for my bad English ...

        Thanks Dave H and again Thanks at all for you help !!!
        Last edited by Feufeu; 01-04-2017, 04:37 PM.

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