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ID part within AC4 chassis..?

Discussion in 'Glowing Bottle Tube Amp Forum' started by natec, Dec 2, 2020.

  1. Dec 2, 2020 #1
    natec

    natec Tele-Meister Silver Supporter

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    upload_2020-12-2_13-26-44.png

    Can any of you identify the 'black ring' (see arrow above) that the speaker wire is looped through inside this AC4? I found this photo online, but mine is identical.

    I'm putting this chassis into a new cab, and I started to unwrap it so that I could use the full length of the speaker wire, but Vox must have a had a reason for it.... (?)
     
  2. Dec 2, 2020 #2
    gregulator450

    gregulator450 Friend of Leo's Silver Supporter

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    I believe it's a shielding device for those wires but I could be wrong.
     
  3. Dec 2, 2020 #3
    john_cribbin

    john_cribbin Tele-Afflicted

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    It's a ferrite choke to reduce RFI. It's what's inside the lumps you often see on laptop power leads.
     
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  4. Dec 2, 2020 #4
    natec

    natec Tele-Meister Silver Supporter

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    Thanks John. Is the 'looping through' twice necessary to be effective, or could I pull it through so that it only encircled one pass of the wire through it?

    If I need to rewire those two leads in order to reach my new speaker, I can do that - I'm *so close* that little bit of length would make a difference.
     
  5. Dec 2, 2020 #5
    john_cribbin

    john_cribbin Tele-Afflicted

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    It's one of those things you could throw away and never miss it, until you are in a situation where RFI is present. Have to say when I had an AC4 I thought the speaker wire was the thinnest cheapest wire they could find. If I'd kept it, I would have replaced it with a heavier guage. May not have made any difference, but it would have made me feel happier.
     
  6. Dec 2, 2020 #6
    natec

    natec Tele-Meister Silver Supporter

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    That's a good perspective, I may as well since I have it all opened up. Thanks again John.
     
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