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Thread: A12 to F5G part 2

  1. #1

    Default A12 to F5G part 2

    A few months back I posted some pics of an A12 to F5G conversion...carved scroll, regraduated top and back, triple bound, fern headstock inlay, burst, lacquered, polished. It looked great but sounded thin and average. I decided to really thin the back out to see if that would help. Then oops, I sanded through the back! O well, let's take a better look inside ( it will be easier to take more beef off the tone bars now too). I took what was left of the back off, and here's what I found. Look at the size of this neck block! It's enormous. In addition to it's weight and stiffness, it's taking up important space in the soundbox. What was Gibson thinking? Anyway, I carved the neck block way down, thinned the tone bars, carved a new back. Now it's a monster, maybe too loud. It sounds like it's plugged in. Anyway, I think this is why stock A12s essentially never sound good. Click image for larger version. 

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    Last edited by bouldermandolin; Sep-09-2019 at 2:48pm. Reason: add picture

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    lenf12 

  3. #2
    Registered User William Smith's Avatar
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    Default Re: A12 to F5G part 2

    NICE! Man that is some wood on that you took off, I figured they were built heavy! Any other pix?

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    Registered User Ken's Avatar
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    Default Re: A12 to F5G part 2

    How is the neck attached? Obviously not a thru dovetail, and not seeing any bolt heads.
    Peace

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    Moderator MikeEdgerton's Avatar
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    Default Re: A12 to F5G part 2

    When it comes to the lump scroll instruments the question "what were they thinking" apparently isn't part of the equation. Apparently they weren't.
    "Bargain instruments are no bargains if you can't play them". These are the words of J. Garber.

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  7. #5

    Default Re: A12 to F5G part 2

    The neck joint is a simple slot rather the a dove tail and the neck is glued in place. Not a good system. The new back I made extends over the heal joint ( the original did not). This should help keep the neck stable.

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    Ken 

  9. #6

    Default Re: A12 to F5G part 2

    Quote Originally Posted by bouldermandolin View Post
    O well, let's take a better look inside ( it will be easier to take more beef off the tone bars now too). I took what was left of the back off, and here's what I found. Look at the size of this neck block! It's enormous. In addition to it's weight and stiffness, it's taking up important space in the soundbox. What was Gibson thinking? Anyway, I carved the neck block way down, thinned the tone bars, carved a new back. Now it's a monster, maybe too loud. It sounds like it's plugged in. Anyway, I think this is why stock A12s essentially never sound good. Click image for larger version. 

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    Wow, amazing, you are practically a lumberjack with the amount of "lumber" you had to remove from the neck block. Thank you for documenting this project and please, keep it coming.

    Len B.
    Clearwater, FL

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