Tubes Asylum

• RE: EC8020 - dave slagle 05:01:40 07/29/23 (1)
  In Reply to: RE: EC8020 posted by ltman on July 28, 2023 at 14:25:52

  is the EC8020ph actually a vacuum tube? The 6.3V @ 700µa "filament" that is polarized and requires DC seems odd.
  
  dave

  • prelim data.   (Open in New Window)

  
  

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  • NOT a Vacuum Tube - Triode_Kingdom 08:24:05 07/29/23 (0)
    In Reply to: RE: EC8020 posted by dave slagle on July 29, 2023 at 05:01:40

    "Input voltage noise density: 1.2nV/√Hz"
    
    No vacuum tube comes close to that. This might be a FET-input design, but I'm betting it's just a low noise opamp.
    
    
    

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