Tube question

Discussion in 'Amps/Cabs Tech Corner: Amplifier, Cab & Speakers' started by 6120, Jan 19, 2006.

  1. 6120

    6120 Member

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    I have a vibroking and it has 2 6v6 power tubes , I noticed while playing at louder volumes and looking at the tubes that the blue flame(light) inside one of the tubes dims when a note is hit. Is this normal?
     
  2. pbradt

    pbradt Senior Member

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    I thought a V-K was a 6L6 amp. If it's running 6V6s, you're probably overheating the hell out of them.
     
  3. 6120

    6120 Member

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    Sorry, the tubes are 6L6 's . phillips 7581A. Anyway should the tube dim,(oly one power tube does it) when played louder?
     
  4. Dave C

    Dave C Gold Supporting Member

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    Yes that is fairly normal and the dimming is common to see due to voltage sag at high volume , but I would expect to see it on both tubes . You might want to swap the power tubes sockets to see if it's just that tube or an indication of a problem with the circuitry on that socket.
    Hope this helps .
    Dave C
     
  5. 6120

    6120 Member

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    Thanks, just the activity in the tubes . Thanks
     

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