Tube DIY Asylum

• Leak did it in their Point One preamp - Ralph 11:24:09 02/25/25 (3)
  In Reply to: RE: EF86 for phono stage? posted by SuperB on February 25, 2025 at 05:49:39

  Link to schematic below

  • https://elektrotanya.com/leak_point_one_stereo_sch.pdf/downl   (Open in New Window)

  
  

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  • RE: Leak did it in their Point One preamp - SuperB 11:38:37 02/26/25 (2)
    In Reply to: RE: Leak did it in their Point One preamp posted by Ralph on February 25, 2025 at 11:24:09

    Lots of feedbacks........
    

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    • I refurbished one of those recently- don't worry about the feedback - Ralph 09:36:17 02/27/25 (0)
      In Reply to: RE: Leak did it in their Point One preamp posted by SuperB on February 26, 2025 at 11:38:37

      I built a power supply for it too since it was bereft of the matching power amps. It was quite musical. The feedback in this preamp is well executed, being mixed with the incoming audio rather than mixed inside the tube. This results in a more musical presentation.
      

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    • Are you looking for passive EQ? - Triode_Kingdom 15:18:16 02/26/25 (0)
      In Reply to: RE: Leak did it in their Point One preamp posted by SuperB on February 26, 2025 at 11:38:37

      The EF86 as pentode could substitute for the first 12AX7 in the RCA passive phono preamp. If the plate resistor was made slightly lower (the original is 100K), I believe little or no change would be required to the RIAA components. The unused half of the 12AX7 could be used in that case as a cathode follower to reduce output impedance. I don't know if anyone has published such a design.

      
      

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      Edits: 02/26/25
• RE: EF86 for phono stage? - Paul Joppa 09:29:12 02/25/25 (3)
  In Reply to: RE: EF86 for phono stage? posted by SuperB on February 25, 2025 at 05:49:39

  I have used the EF86, in the first stage of the Bottlehead "Eros" phono stage design. It's been moderately successful.
  
  I believe the EF86 has been popular for use with studio microphones for decades.
  

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  • Also Akai - Triode_Kingdom 12:33:23 02/25/25 (2)
    In Reply to: RE: EF86 for phono stage? posted by Paul Joppa on February 25, 2025 at 09:29:12

    The EF86 was the tape head amp in Akai M6-M7-M8 reel recorders. I use it as the input/driver in my SE 6V6 amplifier, and also in triode mode as the input stage in my 30W/ch 6L6 amp.
    
    

    
    
    

    
    

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    • Any circuit? (NT) - SuperB 11:39:39 02/26/25 (1)
      In Reply to: RE: Also Akai posted by Triode_Kingdom on February 25, 2025 at 12:33:23

      ?
      

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      • RE: Any circuit? (NT) - Triode_Kingdom 15:11:52 02/26/25 (0)
        In Reply to: RE: Any circuit? (NT) posted by SuperB on February 26, 2025 at 11:39:39

        Which one? I don't think you want mine, because the EF86 is in triode mode (not well-suited for phono mode). I think you should Google search for some of the manufacturers' phono designs that have been suggested in this thread.
        
        
        

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• RE: EF86 for phono stage? - Triode_Kingdom 07:08:27 02/25/25 (0)
  In Reply to: RE: EF86 for phono stage? posted by SuperB on February 25, 2025 at 05:49:39

  Mullard used it, so have others.
  
  
  

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