Posted by Hank Murrow (A) on February 10, 2009 at 15:33:41

Thought the gang here might like to see what started out as a Soul Sister linestage, but has morphed into something beyond that. Starring is Mikey's B7 5K all-cobalt output trannies, preceded by 6C45Pi tubes in parafeed, and supported by a clever PS Paul designed. Shunt-regulated and current-sourced independently using EL84s and solid state where appropriate. the front end uses Shallco switches with Transformer Volume controls by I.A.G. using Sowter shielded trannies. Paul is a fine designer/builder, as you can see from the under-the-hood shot.

Cheers, Hank Murrow

• RE: Linestage by me and Paul Birkeland - AnandR 06:21:25 03/07/09 (0)
  In Reply to: RE: Linestage by me and Paul Birkeland posted by Hank Murrow on February 10, 2009 at 15:33:41

  Great work! I did try the 6C45 in my own headphone/parafeed preamp but I never did like it, although I never went as far as using shunt regulated power supplies, etc....its a tube that requires proper care. Nice to see Horace is still doing okay, I got worried he was going out of business when the Parts Connexion stopped carrying his aluminum enclosures which are very, very nice.
  
  Anand.
  
  

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• very nice work.... - mqracing 09:07:11 02/12/09 (0)
  In Reply to: RE: Linestage by me and Paul Birkeland posted by Hank Murrow on February 10, 2009 at 15:33:41

  I really like the blue bell end covers... nice touch. Paul does really nice assembly work. Kudos and enjoy!!!
  
  MSL
  
  
  
  Builder of MagneQuest™ & Peerless™ transformers since 1989
  
  
  

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• More photos... - Caucasian Blackplate 00:28:05 02/11/09 (5)
  In Reply to: RE: Linestage by me and Paul Birkeland posted by Hank Murrow on February 10, 2009 at 15:33:41

  Here are a couple pix. Note the absence of the old photograph of me, my oldest sister, and a stuffed easter bunny in the background...

  
  
  

  
  

  
  
  

  
  I will have to defer a lot of the credit of the power supply to Paul Joppa. I created the rectifier/filter board and mated it with PJ's hybrid shunt reg design. Also, the circuit is very close to a tried and trusted design of his.
  
  

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  Edits: 02/11/09

  • RE: More photos... - Doc B. 16:12:45 02/13/09 (1)
    In Reply to: RE: More photos... posted by Caucasian Blackplate on February 11, 2009 at 00:28:05

    And PJ's design was my request for a refinement of a previous design by me, which used 6CK4s for the regs and TL-404s at the outputs. Come to think of it that one had JT's reg boards, which came from Broskie's article, C4S's from Buddha, etc., etc. All this good stuff builds upon the work of others.
    
    

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    • RE: More photos... - Hank Murrow 22:25:30 02/13/09 (0)
      In Reply to: RE: More photos... posted by Doc B. on February 13, 2009 at 16:12:45

      Dear Doc;
      Thanks for the history lesson. Makes me even fonder of the preamp, now that I have a better idea of its lineage. As a potter, I was first taught by Bob James, then Hamada Shoji, and Michael Cardew and David Stannard. Later, I taught with George Kokis and learned from Harry Davis. Now, I am passing it on in workshops and on the net, like you guys do at VSAC and here and at the Bottlehead Forum. My thanks to every Bottlehead here, and especially the crew in Poulsbo.
      
      

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  • RE: More photos... - tsingle999 08:36:01 02/12/09 (1)
    In Reply to: RE: More photos... posted by Caucasian Blackplate on February 11, 2009 at 00:28:05

    Looks really cool guys! You'll have to bring it to the next VSAC!
    I like the blue bell ends a lot. How did you do that?
    
    

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    • RE: More photos... - Caucasian Blackplate 12:52:55 02/12/09 (0)
      In Reply to: RE: More photos... posted by tsingle999 on February 12, 2009 at 08:36:01

      That is a little bit of toaster oven powder coating.
      
      

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  • RE: thanks Paul... - Hank Murrow 09:24:45 02/11/09 (0)
    In Reply to: RE: More photos... posted by Caucasian Blackplate on February 11, 2009 at 00:28:05

    
    
    

    
    

    
    
    

    
    Thanks, Paul for adding your comments on the genesis of this project. I include here photos of one of the TVCs, which are beautifully made by Horace Atkinson of I.A.G.
    
    

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