What’s this switch do?

Discussion in 'Amp Input - Normal or Bright' started by Higgins1980, Oct 15, 2021.

  1. Higgins1980

    Higgins1980 Strat-O-Master

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    FF620A9B-1C6F-43F2-908F-5AE9856E5C3C.jpeg The middle one there that selects between ground and switch. And please don’t say it selects between ground and switch.
     
  2. Guitarmageddon

    Guitarmageddon Dr. Stratster

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    "The purpose of the ground switch and 0.047uF death cap is to filter out any noise from the hot wire leading AC current that would cause the amp to buzz or hum. The noisy frequencies would go to ground/chassis via the death cap."
     
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  3. Higgins1980

    Higgins1980 Strat-O-Master

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    Thanks for the quick reply
     
  4. teleamp

    teleamp Strat-Talker Silver Member

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    Oh, so it "lifts" the death caps connection to the chassis?

    In that case, I think I would take the amp to a tech and have the death cap removed and a 3 prong power cord properly installed...

    I thought it was to reverse the polarity of the mains voltage.

    Either way, I would have it checked and corrected as needed.
     
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  5. Higgins1980

    Higgins1980 Strat-O-Master

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    It already has a three prong cord installed on it
     
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  6. Guitarmageddon

    Guitarmageddon Dr. Stratster

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    Your understanding of this is incorrect.

    EDIT - I think MY understanding of this was incorrect
     
    Last edited: Oct 15, 2021
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  7. teleamp

    teleamp Strat-Talker Silver Member

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    So in the "switch" position, the death cap is "lifted"?
     
  8. Higgins1980

    Higgins1980 Strat-O-Master

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    I’m really beginning to like the sound of my strat through this amp. Haven’t used this thing in probably 10+ years.
     
  9. Higgins1980

    Higgins1980 Strat-O-Master

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    So with a three prong cord, how should I have this switch set?
     
  10. Guitarmageddon

    Guitarmageddon Dr. Stratster

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    Please go do some research, I was asked to provide an answer to a direct question - and I found the answer using a google search. I don't know anything about how it works other than what was said in my quote, and it's very self-explanatory to me. It means the ground lift switch can remove hum and send it to the chassis when you have a hum problem. It has nothing to do with the safety of the amplifier.

    EDIT - this post stays, but I think I was WRONG.....
     
    Last edited: Oct 15, 2021
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  11. Guitarmageddon

    Guitarmageddon Dr. Stratster

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    Self-explanatory. You put the switch in the position that gives you less noise and hum.
     
  12. Higgins1980

    Higgins1980 Strat-O-Master

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    Ok. Both positions sound exactly the same. Thanks for your help
     
  13. Guitarmageddon

    Guitarmageddon Dr. Stratster

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    Okay I'm starting to think I might be wrong....let's wait for more answers....
     
  14. Bob Spumoni

    Bob Spumoni Senior Stratmaster

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    Death Cap:
    [​IMG]
     
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  15. teleamp

    teleamp Strat-Talker Silver Member

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    If it has a 3 prong power cord, it may or may not be correctly installed. If they death cap is still connected and that switch is still connected, I would leave it in whichever position lifts the cap from chassis...

    If it were my amp I would want to know for sure.

    Any pics of the wiring?
     
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  16. teleamp

    teleamp Strat-Talker Silver Member

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    THe "death caps" were just capacitors wired from the incoming 115VAC wall outlet to the chassis. If that capacitor fails you could have a serious safety hazard.

    If it were my amp, I would remove the "death cap"...
     
  17. teleamp

    teleamp Strat-Talker Silver Member

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    It has everything to do with safety... In the era that amp was built and sold, people knew to unplug the power cord and rotate the plug 180 degrees and plug it back in if the amp "zapped" them (unacceptable today). And, manufacturers had fewer regulations and less regard for customer safety if a part failed.

    My replies were in response to a question asked on a public forum and based on my knowledge (or lack of) amplifiers and electricity. :)
     
    Last edited: Oct 15, 2021
  18. Guitarmageddon

    Guitarmageddon Dr. Stratster

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    I don't know anything about any of this, I just searched google to try to help the OP.....I'm sorry
     
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  19. teleamp

    teleamp Strat-Talker Silver Member

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    No worries. I want to know for sure and the OP needs to know.
     
  20. TepidPilot

    TepidPilot Strat-O-Master

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    That's what I did when I had a B15N. Also, if I got a shock when briefly and cautiously touching the mic, reversing the ground switch usually eliminated it. Ah, the good ol' sixties - what a decade!

    TP
     
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