Tube DIY Asylum

• RE: thoriated tungsten - WntrMute2 14:50:24 12/17/24 (3)
  In Reply to: RE: thoriated tungsten posted by thermionic addictions on December 13, 2024 at 00:34:26

  
  
  

  
  

  
  
  

  3C24 along with a pair of 866AX rectifiers.
  

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  Edits: 12/17/24

  • RE: thoriated tungsten - thermionic addictions 11:39:03 12/18/24 (1)
    In Reply to: RE: thoriated tungsten posted by WntrMute2 on December 17, 2024 at 14:50:24

    nice! I love eimac tubes they are my favorites. I see you have some 7193's
    down below is that a preamp?
    
    Cal
    
    
    

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    • RE: thoriated tungsten - WntrMute2 13:34:45 12/18/24 (0)
      In Reply to: RE: thoriated tungsten posted by thermionic addictions on December 18, 2024 at 11:39:03

      
      
      

      
      

      
      
      

      
      Yup,a preamp utilizing #76s feeding 2C22s (7193). B+ regulated by the gas VR tubes. Best sounding to my ears as compared with a number of preamps including a Cary SLP-98. has switchable B+ depending on the VR tubes. I like the look of the OA3 compared with the OC3s is why I'm running the lower B+.

      
      

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      Edits: 12/18/24
  • RE: thoriated tungsten - GEO 16:54:38 12/17/24 (0)
    In Reply to: RE: thoriated tungsten posted by WntrMute2 on December 17, 2024 at 14:50:24

    Nice!!
    

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• RE: thoriated tungsten - GEO 09:20:23 12/14/24 (1)
  In Reply to: RE: thoriated tungsten posted by thermionic addictions on December 13, 2024 at 00:34:26

  
  
  

  
  801A
  
  
  

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  • RE: thoriated tungsten - thermionic addictions 14:28:46 12/14/24 (0)
    In Reply to: RE: thoriated tungsten posted by GEO on December 14, 2024 at 09:20:23

    I have several 801A tubes. everytime I start looking into building a new amp I consider using them but haven't yet. Maybe someday I'll get around to trying them.
    
    Cal
    

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• RE: thoriated tungsten - Palustris 17:11:19 12/13/24 (2)
  In Reply to: RE: thoriated tungsten posted by thermionic addictions on December 13, 2024 at 00:34:26

  Push pull stereo HY69 amplifier and it's power supply. The HY69 is a directly heated pentode, here triode connected.
  
  

  
  
  

  
  

  
  
  

  
  

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  • RE: thoriated tungsten - PakProtector 04:14:17 12/17/24 (0)
    In Reply to: RE: thoriated tungsten posted by Palustris on December 13, 2024 at 17:11:19

    Type HY51A is another. There is a 10V 'B' version too... :)
    
    65W, graphite plate in an 866 ST bottle.
    
    Douglas
    Friend, I would not hurt thee for the world...but thou art standing where I am about to shoot.
    
    

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  • RE: thoriated tungsten - thermionic addictions 21:38:24 12/13/24 (0)
    In Reply to: RE: thoriated tungsten posted by Palustris on December 13, 2024 at 17:11:19

    nice! Hytron made some beautiful tubes.
    
    Cal
    

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• RE: thoriated tungsten - RayP 12:16:32 12/13/24 (3)
  In Reply to: RE: thoriated tungsten posted by thermionic addictions on December 13, 2024 at 00:34:26

  Could you post a photo of the underside of the PCB to show how the socket is connected to the terminals?
  
  What kind of tube is it?
  
  ray
  
  

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  • RE: thoriated tungsten - thermionic addictions 00:34:26 12/14/24 (1)
    In Reply to: RE: thoriated tungsten posted by RayP on December 13, 2024 at 12:16:32

    
    
    

    
    Here is the underside of the pcb. I got these on ebay a few years ago but they would be easy enough to make with just a few parts.
    
    Cal
    

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    • RE: thoriated tungsten - RayP 01:17:09 12/14/24 (0)
      In Reply to: RE: thoriated tungsten posted by thermionic addictions on December 14, 2024 at 00:34:26

      Thankyou.
      
      ray
      
      

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  • RE: thoriated tungsten - thermionic addictions 14:02:15 12/13/24 (0)
    In Reply to: RE: thoriated tungsten posted by RayP on December 13, 2024 at 12:16:32

    Hey Ray
    
    The tube is a GU-4 transmitting triode made in Russia for the military.
    It has a standard 4 pin base but only has 3 pins.
    I have never seen one before I ran across it purly by accident on ebay.
    
    Cal
    

    • https://www.radiomuseum.org/tubes/tube_gu-4.html   (Open in New Window)

    
    

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