SET Asylum

• RE: It should match the standard 300b or it is not a 300b - Gordon Rankin 07:57:02 09/11/24 (4)
  In Reply to: RE: It should match the standard 300b or it is not a 300b posted by Leo loves music on July 10, 2024 at 17:12:03

  Leo,
  
  PSE are really hard to build. The problem with DHT's and PSE is no matter how close they are matched, on a transient one tube will swamp the other and then you have this terrible distortion.
  
  I tried this for years and it was a bust. We even tried dual primary output transformers which worked pretty well but it was really expensive to make.
  
  Go for a bigger tube if you need more power.
  
  G.
  J. Gordon Rankin
  
  

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  • RE: It should match the standard 300b or it is not a 300b - Leo loves music 16:30:53 10/25/24 (0)
    In Reply to: RE: It should match the standard 300b or it is not a 300b posted by Gordon Rankin on September 11, 2024 at 07:57:02

    Gordon,
    
    I really appreciate your comments. I have a very good power supply plan. However I didn't realize 300B is this hard to parallel. I always feel a single big tube sounds better than a bunch of small tubes in parallel.
    

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  • RE: It should match the standard 300b or it is not a 300b - Paul Joppa 10:56:05 09/12/24 (2)
    In Reply to: RE: It should match the standard 300b or it is not a 300b posted by Gordon Rankin on September 11, 2024 at 07:57:02

    I've had pretty good luck wiring two SET amps with the secondaries in series rather than parallel. You need two output transformers for this, but the amps can share one driver stage and one power supply.
    
    Pentodes are more comfortable in parallel.
    

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    • RE: It should match the standard 300b or it is not a 300b - Leo loves music 16:32:54 10/25/24 (1)
      In Reply to: RE: It should match the standard 300b or it is not a 300b posted by Paul Joppa on September 12, 2024 at 10:56:05

      This is really cool idea!
      

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      • RE: It should match the standard 300b or it is not a 300b - Leo loves music 19:17:12 10/25/24 (0)
        In Reply to: RE: It should match the standard 300b or it is not a 300b posted by Leo loves music on October 25, 2024 at 16:32:54

        
        
        

        
        .
        

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• Same as a 300b - Chip647 14:14:17 07/13/24 (3)
  In Reply to: RE: It should match the standard 300b or it is not a 300b posted by Leo loves music on July 10, 2024 at 17:12:03

  PSE 300b will get you a barely noticeable +3db volume over a single 300b. Far better to get those 3 dbs (or 10 dbs) with more efficient speakers.
  

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  • RE: Same as a 300b - Leo loves music 11:41:48 07/21/24 (0)
    In Reply to: RE: Same as a 300b posted by Chip647 on July 13, 2024 at 14:14:17

    Thanks for teaching. I have an advanced degree in EE. One of my system is a 100dB horn system.
    
    
    ==================
    Human rights. US government/agent stop torturing me (a tax payer and a citizen). Stop using sonic weapon.
    

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  • +1 (nt) - mhardy6647 02:10:33 07/18/24 (0)
    In Reply to: RE: Same as a 300b posted by Chip647 on July 13, 2024 at 14:14:17

    enn tee
    all the best,
    mrh
    
    

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  • Great perspective. Did not know that. Thanks. nt. - Bas Horneman 04:40:33 07/15/24 (0)
    In Reply to: RE: Same as a 300b posted by Chip647 on July 13, 2024 at 14:14:17

    .
    

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