OTL Asylum

Posted by 6AS7_6SN7 (A) on October 22, 2009 at 02:08:01

Dear Inmates,

Have you ever dreamt of getting out the very best of single ended and circlotron topologies in an OTL amplifier?

Well, I think that I was so lucky in my life to having apparently succeeded in this 'mission impossible'.

This is the conceptual schematic that I am proud to share with all the inmates of the audioasylum.

It requires only one HT voltage and it exhibits the same simulated performance as standard commercial circlotron (no even harmonics at all, predominant third armonic at high level).

In the next posts you will find some snapshots of the currents in the -speaker/coupled inductances/anode common resistor- and the simulated output spectrum @ 330 Hz.

If you ever find this post interesting please make a donation to EMERGENCY humanitarian organization:
http://www.emergency.it/menu.php?A=004&SA=021&ln=En

Best Regards
Luca Cellai
Senior Engineer
Rome, ITALY


ecc230

• AS I have posted to your post over on DIY tubes... - Allen Wright 07:47:19 10/22/09 (1)
  In Reply to: RE: Novel Circlotron Topology posted by 6AS7_6SN7 on October 22, 2009 at 02:08:01

  ...this is NOT a circlotron circuit at all - it is just a differential cothode follower amp.
  
  A circlotron by using two independant powersupplies allows the speaker outout to float free of any bias levels - this doesn't.
  
  Regards, Allen (Vacuum State)
  

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  • AS I have answered to your post over on DIY tubes... - 6AS7_6SN7 23:40:44 10/22/09 (0)
    In Reply to: RE: AS I have posted to your post over on DIY tubes... posted by Allen Wright on October 22, 2009 at 07:47:19

    Nomina sunt rerum.
    
    I am open to change the name of this 'thing' according to the suggestions with the utmost consensus of the inmates.
    
    Best Regards
    Luca Cellai
    
    
    ecc230
    
    

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• Novel Circlotron Topology - Simulated Output Spectrum - 330 Hz - 6AS7_6SN7 02:24:47 10/22/09 (0)
  In Reply to: RE: Novel Circlotron Topology posted by 6AS7_6SN7 on October 22, 2009 at 02:08:01

  
  
  

  
  The simulated output spectrum is exactly the same as the simulated output spectrum of standard circlotron.
  
  ecc230
  
  

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• Novel Circlotron Topology - Currents Snapshot - 6AS7_6SN7 02:21:39 10/22/09 (3)
  In Reply to: RE: Novel Circlotron Topology posted by 6AS7_6SN7 on October 22, 2009 at 02:08:01

  
  
  

  
  The coupled inductors in the schematic (L1 & L2) may be made of a cheap toroidal 110V/110V (1:1) - 150 VA mains transformer.
  
  No saturation of the core will ever occur as the bias currents cancel each other.
  
  Red curve: anode resistor
  Blue curve: speaker load
  Green curves: L1/L2 1:1 coupled inductors
  ecc230
  
  

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  • RE: Novel Circlotron Topology - Currents Snapshot - WALLACE 06:53:26 10/29/09 (2)
    In Reply to: RE: Novel Circlotron Topology - Currents Snapshot posted by 6AS7_6SN7 on October 22, 2009 at 02:21:39

    Have a look at http://www.audiodesignguide.com/doc/aria.html
    
    It's been done before - and the problem is about 3 times the output impedance compaired to a circlotron !
    
    W.
    

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    • My interest for the 'novel circlotron' is over.... - 6AS7_6SN7 03:35:12 11/04/09 (1)
      In Reply to: RE: Novel Circlotron Topology - Currents Snapshot posted by WALLACE on October 29, 2009 at 06:53:26

      Even though I could comment that cathode resistors have a quite different electrical behaviour w.r.t. to a transformer (i.e. coupled inductors) I must admit that, after a deeper investigation, the 'novel circlotron' topology is not able to exhibit a 'decent' simulated performance.
      
      My interest for it has hence gone.
      
      Best Regards
      Luca Cellai
      ecc230
      
      

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      • RE: My interest for the 'novel circlotron' is over.... - WALLACE 03:56:46 11/04/09 (0)
        In Reply to: RE: My interest for the 'novel circlotron' is over.... posted by 6AS7_6SN7 on November 04, 2009 at 03:35:12

        Never mind - new ideas are always worth trying out !
        
        W.
        

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