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• RE: What is the pinging I hear when I first turn on my amps? - moffat 02:47:02 12/23/11 (0)
  In Reply to: RE: What is the pinging I hear when I first turn on my amps? posted by 2bkurius on December 18, 2011 at 09:29:18

  The famous Chineese ping-pong,they are world class and "state of the art"!
  

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• the pinging could be the glass "expanding" during warm-up... - Interstage Tranny 18:16:05 12/22/11 (0)
  In Reply to: RE: What is the pinging I hear when I first turn on my amps? posted by 2bkurius on December 18, 2011 at 09:29:18

  Many vintage "hot" running amps have this happen after turn-off. So, turning off, similar sounds might be the glass cooling down, while contracting...
  

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• RE: What is the pinging I hear when I first turn on my amps? - Al Noakes 12:58:17 12/20/11 (0)
  In Reply to: RE: What is the pinging I hear when I first turn on my amps? posted by 2bkurius on December 18, 2011 at 09:29:18

  Filament springs tensioning as the tube warms . Nothing to worry about unless the noise is continuous .
  
  What output tubes are you using ?
  
  Al
  

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• It's tube heating up and expanding. Definately not shot noise. - Bas Horneman 04:24:41 12/20/11 (3)
  In Reply to: RE: What is the pinging I hear when I first turn on my amps? posted by 2bkurius on December 18, 2011 at 09:29:18

  Shot noise is what a tube emits constantly throughout its lifetime.
  To infinity and beyond!!!
  
  

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  • RE: It's tube heating up and expanding. Definately not shot noise. - drlowmu 15:14:47 12/20/11 (2)
    In Reply to: RE: It's tube heating up and expanding. Definately not shot noise. posted by Bas Horneman on December 20, 2011 at 04:24:41

    No No, re-read my post (below) please - as I clearly explained, its from all the electrons' six shooters going off Bas!! Shot noise. In America, particularly the wild West, electrons in the tubes all carry six shooters. Not so in Europe ???

    :-)
    

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    Edits: 12/20/11   12/20/11

    • No you are wrong. Very very very wrong. - Bas Horneman 13:16:32 12/22/11 (1)
      In Reply to: RE: It's tube heating up and expanding. Definately not shot noise. posted by drlowmu on December 20, 2011 at 15:14:47

      Shot noise is almost like a thermal noise but different.
      
      Please for once do some homework. You really think that if you shout louder it aint so?
      
      The op is asking about the noise that you hear during startup of say EL84 tubes.
      
      
      To infinity and beyond!!!
      

      • Do some study for once.   (Open in New Window)

      
      

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      • "Shot Noise characteristic is white." - Tre' 17:40:52 12/22/11 (0)
        In Reply to: RE: No you are wrong. Very very very wrong. posted by Bas Horneman on December 22, 2011 at 13:16:32

        Shot Noise characteristic is white.
        
        "2. Shot Noise
        
        Shot Noise normally occurs when there is a potential barrier (voltage differential).
        
        PN junction diode is an example that has potential barrier. When the electrons and holes cross the barrier, Shot Noise is produced.
        
        For example, a diode, a transistor, and vacuum tube, all will produce Shot noise.
        
        A junction diode will typically have two components of noise. One is Thermal Noise, and the other is Shot Noise.
        
        Note that if the active device provides amplification, the noise also gets amplified along with the signal.
        
        On the other hand, a resistor normally does not produce Shot Noise since there is no potential barrier built within a resistor. Current flowing through a resistor will not exhibit any fluctuations. However, current flowing through a diode produces small fluctuations. This is due to electrons (in turn, the charge) arriving in quanta, one electron at a time. The current flow is not continuous, but limited by the quantum of the electron charges.
        
        Shot Noise is proportional to the current passing through the device.
        
        Shot Noise characteristic is white."
        
        
        .
        Have Fun and Enjoy the Music
        "Still Working the Problem"
        

        • http://www.qsl.net/va3iul/Noise/noise.html   (Open in New Window)

        
        

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• This is called "Shot Noise" in Electronics - drlowmu 11:24:48 12/19/11 (0)
  In Reply to: RE: What is the pinging I hear when I first turn on my amps? posted by 2bkurius on December 18, 2011 at 09:29:18

  And you are clearly hearing the actual sound of the electrons, inside the tube, firing off their six guns at each other, after being rudely woken up by the unexpected jolt of electricity on initial turn-on. You can learn all about these little electron guys, in Rider's classic book, "Inside the Vacuum Tube" and wear your 3-D glasses while viewing it.
  
  
  Jeff Medwin
  

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• Well my Wavac EC 300B with WE tubes does this too. I don't have a clue why. NT - jnr 16:41:57 12/18/11 (0)
  In Reply to: RE: What is the pinging I hear when I first turn on my amps? posted by 2bkurius on December 18, 2011 at 09:29:18

  .
  Beatnik's stuff http://web.me.com/jnr1/Site/Beatniks_Pictures.html
  
  

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• My Mesh Plate Chinese 300B tubes do this............. - Cut-Throat 10:47:03 12/18/11 (0)
  In Reply to: RE: What is the pinging I hear when I first turn on my amps? posted by 2bkurius on December 18, 2011 at 09:29:18

  I would guess that it's the metal contracting and expanding as it warms up.
  
  

  Cut-Throat
  

  
  
  
  
  

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