HELP! Drilling speaker mount holes on the speaker frame?

Discussion in 'Amps and Cabs' started by imguitardan, Feb 15, 2012.

  1. imguitardan

    imguitardan Member

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    I have a pair of 70's Celestion G12H30s (that were damaged during shipping and re-coned by Orange Co. Speakers (one 55 and one 75hz cone)). The speakers only have four holes on the frame for mounting to the baffle but I want to use them in an old Valco amp that has 8 mounting screws on the baffle (per speaker). CAN I DRILL THE HOLES ON THE SPEAKER FRAME WITHOUT RUINING THE FRAME? Has any one done this? Do I need to have it professionally done?
    Thanks
     
  2. zenitB

    zenitB Supporting Member

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    You could try drilling the old Celestions but my solution would be to remove four mounting studs from the baffle board. Some are easily removed by pushing on the stud and pulling it through 'under' the grille cloth. Save them for later and you won't hurt the value of the amp.
     
  3. Crowder

    Crowder Dang Twangler Silver Supporting Member

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    It's pretty easy to drill more holes in the speaker frame. You just need a drill and the right sizetal bit. Measure twice drill once. :)
     
  4. Tonesmiths

    Tonesmiths Member

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    Funny you should ask. I just installed a 4 hole speaker on a '64 FDR that had 8 bolts. I ended up cutting off every other bolt on the baffle with a Dremel carbide disk. It came out much cleaner than I could ever imagine drilling a speaker frame would. Besides, if 4 bolts weren't sufficient, all of the boutique speaker builders would be making them with 8.
     
  5. solitaire

    solitaire Senior Member

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    Depending on the gasket material used for your speakers drilling holes can be a bit adventerous actually. You're likely to have to cut the gasket out out where the drill is supposed to go or it easily will get tangled up in the drill. If the bolts are not easily removable then cutting the bolts or drilling holes... really a choice between two bad things.
     
  6. big mike

    big mike Moderator - EL34 Emeritas Staff Member

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    Dude. Cut the bolts. don't F with the speaker frame.
     
  7. smolder

    smolder Gold Supporting Member

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    go with this!
     
  8. picnic

    picnic Supporting Member

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    ditto dat
     
  9. imguitardan

    imguitardan Member

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    On a '66 Valco?
     
  10. Mark Robinson

    Mark Robinson Member

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    If the Valco amp cab is collectable, make or purchase a replacement cabinet. It's not difficult to improve on the original. Leon Chalnick does it all the time, it's the way to go.

    From what I've seen, those department store type amps are usually placed in cabinets for which "Cabinet" is a generous characterization, more like a masonite suitcase thing that's first cousin to a carboard box only smells worse.

    If you plan to drill the speaker, at least use a drill press and clamps so that you don't have a stupid disaster moment, culminating in an un-authorized visit of a hand held drill bit, into the speaker cone!
     
  11. imguitardan

    imguitardan Member

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    The gasket appears to be a heavy duty type cardboard or fiber board.
     
  12. jazzguitar

    jazzguitar Supporting Member

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    When I tried a V30 in my '66 DR I bolted the new speaker to the old one and used the old speakers holes as a template for where to drill. It worked like a charm and I didn't have to modify my amp. Just be sure to tape up the speakers so you don't get metal shards somewhere they shouldn't be.
     
  13. imguitardan

    imguitardan Member

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    Nice technique. Maybe I'll give that a shot. Thanks!
     

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