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• RE: The little test holes for biasing, what are those called? - mwhouston 01:52:19 07/25/12 (0)
  In Reply to: RE: The little test holes for biasing, what are those called? posted by Paully on July 24, 2012 at 17:13:04

  There are a few names but I would just call them biasing points. As you know you drop a meter into them and a adjust a pot (in the middle) to obtain a certain bias current.
  retro-thermionic
  http://www.retro-thermionic.blogspot.com.au/
  Mongrel Dog Audio
  http://mongreldogaudio.blogspot.com.au/
  
  

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• Test points - 1973shovel 17:29:17 07/24/12 (4)
  In Reply to: RE: The little test holes for biasing, what are those called? posted by Paully on July 24, 2012 at 17:13:04

  or test point jacks

  • For example   (Open in New Window)

  
  

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  • RE: Test points - mwhouston 06:33:17 07/25/12 (1)
    In Reply to: RE: Test points posted by 1973shovel on July 24, 2012 at 17:29:17

    Yes probably test point jacks is a better name. There is a 1ohm resistor in the cathode leg of the 6C33C. These test points are wired across the 1ohm resistor. By adjust a 25 turn trim pot the voltage (which is about 0.2V or 200mV) across this resistor varies as the 6C33C passes more or less current due to changes in bias.
    
    The current changes are reflected directly across the cathode resistor (as voltage changes) and can be read off a inexpensive meter from the test jacks.
    retro-thermionic
    http://www.retro-thermionic.blogspot.com.au/
    Mongrel Dog Audio
    http://mongreldogaudio.blogspot.com.au/
    
    

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    • I simply called them what Mouser and DigiKey list them under - 1973shovel 13:19:18 07/26/12 (0)
      In Reply to: RE: Test points posted by mwhouston on July 25, 2012 at 06:33:17

      Just so he could find them!
      
      Nice amp, by the way.
      

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  • Perfect! - Paully 18:48:52 07/24/12 (1)
    In Reply to: RE: Test points posted by 1973shovel on July 24, 2012 at 17:29:17

    Just what I needed to know. Thanks!
    

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    • You're very welcome! (nt) - 1973shovel 09:14:40 07/26/12 (0)
      In Reply to: RE: Perfect! posted by Paully on July 24, 2012 at 18:48:52

      
      

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