Will the chassis from a plexi 50 watt bass head fit in a large 100w plexi head cabinet?

Discussion in 'Cabinets & Speakers' started by Jason.Eldon, May 27, 2020.

  1. Jason.Eldon

    Jason.Eldon New Member

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    Hey everyone!

    I have a quick qestion and hoped I could get some advice. I've always wanted a 50w super Bass and recently was able to get a good deal on a Ceria Tone Plexi 50 Bass chassis. It's being shipped to me now and I was wondering if it would fit in my larger 100w Plexi head shell I already have or would I need the smaller 50w style head cabinet for it?

    Really appreciate you taking the time to read my message and hope you're all keeping safe!

    Jay
     
  2. pulsonicsound

    pulsonicsound Well-Known Member

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    Heya Jay, if the chassis is Marshall spec it’ll fit, although you’ll have to drill new bolt holes, Marshall used the large 100w headbox for the 50w amps from 1972 onwards anyhow
     
  3. Jason.Eldon

    Jason.Eldon New Member

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    Wow that was fast, thank you!

    My apologies but I'm a bit of a noob when it comes to this stuff. What do you mean by new bolt holes? Also, is installing a chassis into a head shell difficult or dangerous to do?
     
  4. Seanxk

    Seanxk Well-Known Member

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    The holes that the fixing bolts use to hold the chassis in the head box, they will most likely not line up with the old ones.
    If you have been using the amp, let it cool down/discharge for half an hour before fitting it in and obviously don't have it connected to the mains.
     
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  5. ampmadscientist

    ampmadscientist Well-Known Member

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    No it's not dangerous.
    Full speed ahead. Be fearless.
    You learn from your mistakes.
    However, if you should meet with some unfortunate circumstance, you will be immortalized, in the Marshall Amp Forum Hall of Fame for extraordinary bravery in the face of chassis mounting screws...
    And be assured that you will not be forgotten (easily).
     
  6. pulsonicsound

    pulsonicsound Well-Known Member

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    As @Seanxk mentioned above, 4 bolts secure the chassis to the head shell

    it’s really fiddly getting them just right, I measure, put on some painting tape to mark in pencil for the holes, double check/measure again etc then the drill holes.

    As long as you don’t touch any of the guts you’ll be ok! I manoeuvre the chassis around by holding the transformers, you may want to remove power valves if your worried about bashing them

    The only other thing to add is that the faceplace will just fit in the head shell cut out so make sure that’s right before you drill!

    Also take a pic for us!
     

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