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SB-220

Discussion in 'Amateur Radio Amplifiers' started by WB4YVO, May 16, 2020.

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  1. WB4YVO

    WB4YVO Ham Member QRZ Page

    ALL you SB-220 and 3-500Z experts out there...I am sure this has been asked already.. But does someone have a picture of how to Ground the Grids?

    What is the most common practice.. Direct each pin.. or tying pins together and then grounding..

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  2. W1QJ

    W1QJ Ham Member QRZ Page

    I usually fold the grid pin back toward the chassis and use the solder lugs that normally grounded the caps to ground the grids to the chassis by drilling a hole and grounding the lug and soldering it to the prod pin folded back. Any very short path to ground works well. The shorter the better.
     
  3. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    Each pin, very short path -- not "wire."
     
  4. N8VIL

    N8VIL Ham Member QRZ Page

    Use copper. I did mine first in brass then learned what a poor conductor brass is for this purpose. I got the idea from WA7PRC in a previous post.

    DSCN2827.JPG DSCN2818.JPG
     
    W1BR and WA7PRC like this.
  5. WA7PRC

    WA7PRC Ham Member QRZ Page

    :)
     
  6. N8VIL

    N8VIL Ham Member QRZ Page

    I forgot to mention that I used a Scotch Brite pad to "clean" the aluminum where the copper is fastened to ensure a good connection.
     
  7. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    I hope you followed with the time-honored tradition of having some good Scotch after the job was finished.:)
     
    KL7SG and N8VIL like this.
  8. WB4YVO

    WB4YVO Ham Member QRZ Page

    Roger that Will do

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  9. W2WDX

    W2WDX Premium Subscriber QRZ Page

    I must add ... make sure that Scotch is ingested AFTER the work is complete.
     
  10. WB2WIK

    WB2WIK Platinum Subscriber Platinum Subscriber QRZ Page

    Of course.

    But make it a good Scotch.

    And then don't drive. Or take the cover back off the amp.:)
     

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