• RE: 45 Parafeed Output Transformer - tsingle999 06:32:38 02/26/17 (13)
  In Reply to: RE: 45 Parafeed Output Transformer posted by mqracing on February 26, 2017 at 05:59:21

  I use a dowdy choke with tfa2004sr's. Unbelievable bass. But it is 3k not 5k
  

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  • RE: 45 Parafeed Output Transformer - mqracing 16:34:25 03/06/17 (1)
    In Reply to: RE: 45 Parafeed Output Transformer posted by tsingle999 on February 26, 2017 at 06:32:38

    Don't you have a pair of 2004 JR silver in channel frames?

    I'd love to hear those myself.

    And I built a very special pair of all silver TFA-2004 JR Mexico for Xcortes.
    These are probably my very favorite coil design in this series.

    I can build the Mexico's in copper magnet wire.

    MSL
    

    
    
    
    Builder of MagneQuest & Peerless transformers since 1989
    
    
    

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    Edits: 03/06/17

    • RE: 45 Parafeed Output Transformer - tsingle999 13:35:19 03/07/17 (0)
      In Reply to: RE: 45 Parafeed Output Transformer posted by mqracing on March 06, 2017 at 16:34:25

      Oh yes I also have a SR45 a,p with silver 2004 jr's and cobalt plate chokes.It sounds amazing too!
      

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  • RE: 45 Parafeed Output Transformer - OldNuke 11:03:37 02/26/17 (10)
    In Reply to: RE: 45 Parafeed Output Transformer posted by tsingle999 on February 26, 2017 at 06:32:38

    I have Dowdy chokes on my 45 amp with EXO145's. And Dowdy chokes on a tfa2004 2A3 amp also, I agree they just sound amazing. I'm looking to see it there's an intermediate step up before the $$$$ silver outputs.
    

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    • RE: 45 Parafeed Output Transformer - mqracing 16:36:47 03/06/17 (1)
      In Reply to: RE: 45 Parafeed Output Transformer posted by OldNuke on February 26, 2017 at 11:03:37

      Count your blessings the EXO-145's are very rare and very cool.
      
      Treasure them!
      
      
      
      Builder of MagneQuest & Peerless transformers since 1989
      
      
      

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      • RE: 45 Parafeed Output Transformer - OldNuke 18:50:01 03/06/17 (0)
        In Reply to: RE: 45 Parafeed Output Transformer posted by mqracing on March 06, 2017 at 16:36:47

        And they sound great, just seeing if there was a step up. If not I'm perfectly happy leaving this amp alone and experimenting with another 45 amp. Your suggestions work out very well, I'm loving the 45 headphone amp you helped me with.
        

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    • RE: 45 Parafeed Output Transformer - Ed Sawyer 11:29:46 03/06/17 (1)
      In Reply to: RE: 45 Parafeed Output Transformer posted by OldNuke on February 26, 2017 at 11:03:37

      Cobalt EXO-45s would come to mind as perhaps better than silver versions, even.
      

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      • RE: 45 Parafeed Output Transformer - OldNuke 14:54:40 03/06/17 (0)
        In Reply to: RE: 45 Parafeed Output Transformer posted by Ed Sawyer on March 06, 2017 at 11:29:46

        But impossible to get someone to give up there pair. Mike has said there's limited to no supply of material.
        

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    • RE: 45 Parafeed Output Transformer - johnsonad 12:30:36 02/26/17 (5)
      In Reply to: RE: 45 Parafeed Output Transformer posted by OldNuke on February 26, 2017 at 11:03:37

      I'm using EXO-050's (full nickel) and TL-404's in a 300B amp switched and like the 050's a little better than the 404's.
      
      The build I want to use this OPT in has less than a watt output and already has 404's in it. Given my experience with the two transformers above, I too am looking for something special that can output 4 Ohms on the secondary.
      
      I'm looking forward to your ideas Mike!
      

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      • RE: 45 Parafeed Output Transformer - mqracing 16:45:44 03/06/17 (4)
        In Reply to: RE: 45 Parafeed Output Transformer posted by johnsonad on February 26, 2017 at 12:30:36

        The MEXICO models are particularly optimized for 4 ohm (low impedance) secondary loads.
        
        
        
        Builder of MagneQuest & Peerless transformers since 1989
        
        
        

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        • RE: 45 Parafeed Output Transformer - johnsonad 18:13:48 03/06/17 (3)
          In Reply to: RE: 45 Parafeed Output Transformer posted by mqracing on March 06, 2017 at 16:45:44

          Which Mexico model has a 5k primary?
          

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          • RE: 45 Parafeed Output Transformer - mqracing 18:41:13 03/06/17 (2)
            In Reply to: RE: 45 Parafeed Output Transformer posted by johnsonad on March 06, 2017 at 18:13:48

            I'm debating which model to build in the Mexico format. Each candidate would involve a redesign...

            Here's the candidates:

            EXO 40 Series. 5k primary. Parafeed. As Mexico it would have secondary impedances of 16, 8, and 4 ohms.

            TFA-200? JR a five K version of the TFA-2004 MEXICO.

            I'm very much leaning toward the EXO FORTY devices as I have a much greater inventory of cool laminations (M3, M4, M6, and low nickel) in this size whereas my inventory of the good stuff in the 2004 core size is much more limited and is very difficult to source these days.

            Plus smaller core sizes are magnetically more efficient due to the shorter magnetic path length.

            Someday I have to say more about core materials and buyers' preferences... and how there's some really AWESOME state of the art core mats that don't enjoy the buzz factor (sadly) that say nickel and cobalt do...

            I'm game for input, feedback, ideas, suggestions... a discussion of what may be desirable and what may be practical...

            MSL

            
            

            
            
            
            Builder of MagneQuest & Peerless transformers since 1989
            
            
            

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            Edits: 03/06/17   03/06/17   03/06/17   03/06/17   03/06/17   03/06/17

            • RE: 45 Parafeed Output Transformer - OldNuke 09:12:28 04/04/17 (0)
              In Reply to: RE: 45 Parafeed Output Transformer posted by mqracing on March 06, 2017 at 17:41:13

              Hi Mike,
              Just touching back with you on these transformers. Are your new core mats on or above the level of the Mexico PS or Quad core outputs you made? These are definitely an Awesome set of outputs.
              
              I think the love for nickel and cobalt to me comes from the detail in the mid range you can hear in very low power amps. I bet they really shine with another couple of watts power but I haven't heard any in a > 4 watt amp.
              
              My 2 cents (should be 50 with inflation) is let's generate the buzz. There won't be any talk until you get them in the hands (ears) of people with amps and I'm all in for experimenting.
              Alonzo
              

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            • RE: 45 Parafeed Output Transformer - OldNuke 21:33:44 03/11/17 (0)
              In Reply to: RE: 45 Parafeed Output Transformer posted by mqracing on March 06, 2017 at 18:41:13

              Didn't you used to make a EXO-50 (5K 4,8.16 ohms)? How far off would it be to go this route and only make the 8 ohm, or 4 ohm, whichever would give the longest unbroken run in a Mexico version? A somewhat compromise so that you don't have to add the additional taps into the winding.
              
              

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