• Re: about 6c45 - akltam 23:33:51 12/13/04 (2)
  In Reply to: Re: about 6c45 posted by knugen on December 13, 2004 at 23:16:11:

  http://www.audiodesignguide.com/my/pp3.html

  The above is the poweramp that I have built but I use 6C45. I am using 6550 in triode mode. Also I am using fix bias instead of cathode bias. Make sure that the 6c45 on both channel are matched properly. Other than that I do not do anything particular.
  
  

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  • Which LL1660 with 6c45 at 30 ma - Francois G 11:38:23 12/14/04 (1)
    In Reply to: Re: about 6c45 posted by akltam on December 13, 2004 at 23:33:51:

    I have been thinking about building Andreas Cuofoli's PP design also, but what LL1660 are you using with 6c45 at 30 ma? If you are using the one specified how is it behaving (sounding) at 50% over the recommended max current? I'm asking because I have a pair of the interstages as Cuofoli specified and wondered if they can be used at higher current with any success.

    Thanks,
    Francois
    
    

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    • You forgot one very important thing. - akltam 20:28:22 12/14/04 (0)
      In Reply to: Which LL1660 with 6c45 at 30 ma posted by Francois G on December 14, 2004 at 11:38:23:

      Since I need to get enough gain, I am using 2.25 : 2 + 2.

      and that means I need to parallel the 2.25 coil which means that allowable DC current to run through the interstage LL1660 is doubled.

      i.e. if you use a LL1660/18mA using the 2.25:2+2 configuration, the allowable DC current that goes through the 2.25 coil (in parallel) will be just under 36mA. This is adequate for running your 6C45 beyond 30mA.

      Using these parameters, the 18mA version will give you the highest inductance (required for low freq) required.

      I am using the LL1663 (5K:8 ohm) output transformer. The amp using these configurations will give you a gain of around 17-18. which should be adequate for general use.

      Alan

      
      
      

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