Posted by KevinC (M) on May 18, 2009 at 07:09:33

In Reply to: RE: Need help for RIT5 PF posted by KPreeda on May 17, 2009 at 04:26:12

With a bifilar wound transformer, switching the polarity of the leads should have a marked effect on the response at 1KHz, due to the marked change in capacitance. Either you didn't actually change the lead polarity (believe me, I've unsoldered wires and then resoldered them just as they were thinking that I'd made a change) or your problem originates elsewhere. Do you have a postable schematic?

Kevin Carter
K&K Audio
www.kandkaudio.com

• RE: Need help for RIT5 PF - KPreeda 07:37:58 05/18/09 (6)
  In Reply to: RE: Need help for RIT5 PF posted by KevinC on May 18, 2009 at 07:09:33

  
  
  

  
  Hi Kevin,
  
  Here's the schematic. It performs pretty good with resistor loaded but didn't work well when I put transformer in, unfortunately.
  
  

  ---

  • RE: Need help for RIT5 PF - KevinC 09:10:18 05/18/09 (5)
    In Reply to: RE: Need help for RIT5 PF posted by KPreeda on May 18, 2009 at 07:37:58

    Given that you don't have an IT in the schematic, we need more info to comment. So,
    
    Where is the IT and how is it hooked up?
    What is the tube to be driven and what are its operating point parameters?
    
    Kevin Carter
    K&K Audio
    www.kandkaudio.com
    
    

    ---

    • RE: Need help for RIT5 PF - KPreeda 09:25:35 05/18/09 (4)
      In Reply to: RE: Need help for RIT5 PF posted by KevinC on May 18, 2009 at 09:10:18

      
      
      

      
      Hi Kevin,
      
      This is how I connect the transformer. 6W6 was biased at 224V 22mA, -22V cathode bias with 10M45 as plate load. When I connected 27K resistor after the coupling cap as a load, the driver could make more than 300Vpp at the resistor. Replacing the resistor with transformer, I terminated the secondary with the same resistor, the output started to distort, which looked like saw wave, around 120Vpp. I also tried without terminated resistor and got the same result.
      
      I don't have the picture of the distort signal for now. I'll post it later this weekend.
      
      

      ---

      • RE: Need help for RIT5 PF - mqracing 15:37:18 05/18/09 (3)
        In Reply to: RE: Need help for RIT5 PF posted by KPreeda on May 18, 2009 at 09:25:35

        Hi Karin:

        First and foremost--- it is NECESSARY that you hook-up the transformer the proper way. It is not an option, not something that would be nice to do... this transformer will NOT work properly the way you have it hooked up.

        The ill-gotten behaviour that you're getting--- which we too have gotten on the test bench when you hook up either side of this transformer improperly---

        A great customer from Italy of ours bought a pair of transformers which were also bifilar wound--- inadvertently he had hooked up the primary on one unit the wrong way--- he wrote to me and was alarmed that the distortion was unmistakbly much larger on the one transformer than the other one--- and it was in the midband and higher frequencies where the behaviour was so bad.... the fix was simple... once he unsoldered the pri leads on the offending trans and hooked them up the right way... his troubles were gone.

        But the fix is simple--- hook this transformer up the proper way.

        RED on the primary MUST go to ground.

        Black on the secondary MUST go to ground.

        
        If your not seeing or getting some real noticeable changes in the behaviour of this transformer when you switch the primary wires...
        from being hooked up improperly to being hooked up properly... then I would be absolutely stumped.

        MSL

        Addendum: Please also note that operating this transformer is at a much greater risk of having a voltage breakdown from pri to sec windings when hooked up improperly. DO NOT OPERATE this transformer other than as prescribed.

        
        

        Builder of MagneQuest™ & Peerless™ transformers since 1989
        

        
        
        

        ---

        Edits: 05/18/09   05/18/09   05/18/09   05/18/09

        • It's working! - KPreeda 09:23:52 05/22/09 (1)
          In Reply to: RE: Need help for RIT5 PF posted by mqracing on May 18, 2009 at 15:37:18

          Hi Mike,
          
          It's working now. The RIT5 can now make 300Vpp with great frequency response. I measure 20Hz-28KHz -1dB at 300Vpp. Thank you for your advise and patience explaining your design to me!
          
          

          ---

          • Great! - mqracing 20:37:56 05/22/09 (0)
            In Reply to: RE: It's working! posted by KPreeda on May 22, 2009 at 09:23:52

            Now give them some time to break in and I think you'll find your path to musical bliss :=)
            
            Mike
            
            
            
            Builder of MagneQuest™ & Peerless™ transformers since 1989
            
            
            

            ---
        • RE: Need help for RIT5 PF - KPreeda 16:31:37 05/18/09 (0)
          In Reply to: RE: Need help for RIT5 PF posted by mqracing on May 18, 2009 at 15:37:18

          Hi Mike, thanks for the instruction. I'll try again this weekend and let you know the result.
          
          

          ---

Post a Followup:

---

[ Follow Ups ] [ Post Followup ] Thread: [ Display  All  Email ] [ MagneQuest/Peerless Forum ]
[ Comment ] [ Edit ] [ Delete ] [ Copyright Warning! Click for Details ]

---

[ Top of Page ] [ Contact Us ] [ Support/Wish List ] [ Copyright © 2009, Audio Asylum, all rights reserved ] [ Go Green ] [ Take5 ]

---

[ General ] [ Speakers ] [ Tubes ] [ Vinyl ] [ Digital ] [ Hi-Rez ] [ Video Asylum ] [ Cables ] [ Tweaks/DIY ] [ Music ] [ Films ]

---