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3-500Z Filament To Grid Shorts, The Other Cause

Discussion in 'Amateur Radio Amplifiers' started by AF6LJ, Jan 22, 2012.

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  1. AG6K

    AG6K QRZ Member QRZ Page

     A better x-ray:
    3-500_x-ray.jpg
     
  2. AF6LJ

    AF6LJ Ham Member QRZ Page

    That is a better X-Ray, Have you tried to straighten the filament in this one yet?
     
  3. N3JBH

    N3JBH Ham Member QRZ Page

    Rich @ 2960.33 degree Fahrenheit there is not a lot of metals that wont move
     
  4. AG6K

    AG6K QRZ Member QRZ Page

     agreed Jeff.
     
  5. AG6K

    AG6K QRZ Member QRZ Page

     We tried today. The X-ray was no help. We found the direction of the bend by increasing the current in the filament-grid arc. After centrifuging the filament-grid BDV increased about 30%. Next time I raise the filament V. and find someone who can spin it faster.
     
  6. W1QJ

    W1QJ Ham Member QRZ Page

    Rich, are any of these the tubes I sent you? Lou
     
  7. AG6K

    AG6K QRZ Member QRZ Page


     No Lou. We have been experimenting with the 3 we had on hand. Things have been going pretty slow lately since helper girl #3 has started cosmetology school and helper girl #4 - a.k.a. Wonderwoman - is expecting.
     
    Last edited: Feb 29, 2012
  8. AF6LJ

    AF6LJ Ham Member QRZ Page

    Might be tine to build a centrifuge, there are plenty of washing machines out there that could be converted for this application.
     
  9. AG6K

    AG6K QRZ Member QRZ Page

     Yes. It improved the filament/grid BDV about a third so it seems we are moving it in the right direction.
     
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