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Vox Defiant/Conqueror/Supreme cabinet replacement screws. Where can I get them?

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  • Vox Defiant/Conqueror/Supreme cabinet replacement screws. Where can I get them?

    I have a '67 Defiant. The preamp chassis is isolated/covered/enclosed with a piece of sheet metal and 6 machine screws are used to hold them together. When I bought the amp there were only 2 left out of six. I am trying to locate replacements. The width of the screw appears to be #6, and on an American thread gauge the thread pitch measures 38. The width does not match any metric number so I take that to mean that this is not a metric screw.

    I cannot find these danged things. Are they perhaps Whitworth screws? I don't know enough about that scale to be able to figure out what to buy for a replacement. Does anyone know about these things and where to buy them?

    Thanks

  • #2
    How about a picture along side a ruler?

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    • #3
      Originally posted by Jazz P Bass View Post
      How about a picture along side a ruler?

      There's really nothing to show. It is a machine screw, length 1/4", width is #6, thread pitch 38. Screw head is slot "cheese" type, which is a similar to the pan top but with cylindrical sides. For replacements I really don't care what the screw head is like as long as it is not oval or countersunk.

      Thanks

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      • #4
        So the problem is that #6 screws come in 32 or 40 pitch? For sure it's not 40?
        "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

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        • #5
          Ok, apparently there is a British Association measurement, 4BA that is 38 tpi.
          British Tools & Fasteners, LLC
          "Everything is better with a tube. I have a customer with an all-tube pacemaker. His heartbeat is steady, reassuring and dependable, not like a modern heartbeat. And if it goes wrong he can fix it himself. You can't do that with SMD." - Mick Bailey

          Comment


          • #6
            Originally posted by g-one View Post
            Ok, apparently there is a British Association measurement, 4BA that is 38 tpi.
            British Tools & Fasteners, LLC
            Looks good! THanks for the link. Of course they are out. 4BA x 1/4, but I have to see if the screw diameter is correct.
            Last edited by cthulhu; 03-23-2014, 09:41 PM.

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            • #7
              All the vintage Vox amps I've ever seen have BA threads. My favourite thread of all time (doesn't everyone have a favourite thread?). Lots of British manufacturers continued to use BA into the 70s - there were a good many years of parallel running with ISO Metric before supplies of BA fasteners began to decline. Still used here in England for model engineering.

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              • #8
                Originally posted by Mick Bailey View Post
                All the vintage Vox amps I've ever seen have BA threads. My favourite thread of all time (doesn't everyone have a favourite thread?). Lots of British manufacturers continued to use BA into the 70s - there were a good many years of parallel running with ISO Metric before supplies of BA fasteners began to decline. Still used here in England for model engineering.
                I had never even heard of "BA"= British Association specs until this thread. Is that part of Whitworth?

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                • #9
                  Whitworth is a coarse thread, very close to UNC. BA is a relatively fine thread that was used mainly for small-scale work such as scientific instruments and the like. The largest size 0BA is 6mm diameter with a 1mm pitch. Its a well thought-out system of sizes and thread pitch and I still use it quite a bit.

                  When you get old British equipment of any kind it's almost 100% that the smaller threads with be BA. Larger ones will generally be BSF or Whitworth.

                  The problem with standards is that there's so many.

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                  • #10
                    Found this older post while doing an internet search since I need similar screws to secure the sheet metal housing for a British Vox Foundation SS head. All mine are missing so my question is if the 4BA turned out to be the correct ones?

                    I also need some 3/4" countersunk (flat head) screws that are missing on a Goodmans Midax horn. On the few original ones I have, the head diameter is 7 mm across and the threads measure 4 mm across overall. I originally thought these might be 2BA but based on charts I found on the net, I'm now thinking they are actually 3BA. Was wondering if anyone had any experience on which might be the correct BA for the Midax horn.

                    I was also interested in the comment that all vintage Vox amps have BA threads. For some reason I assumed the back panel screws for British Vox amps were Whitworth.

                    I found this place in the UK to order my BA screws once I figure out which ones I actually need which will be less expensive than ordering from the US company, at least for small orders: https://www.ba-bolts.co.uk
                    Last edited by INB555; 09-16-2020, 02:59 AM.

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                    • #11
                      http://www.voxshowroom.com/northcoast/vox/hardware/index.html
                      Cabinet Hardware for Vox Amps

                      http://www.voxshowroom.com/northcoast/vox/hardware/misc_hardware.html
                      Screws and Fasteners for Vox Amplifiers

                      Who does not know and knows that he does not know - teach him Confucius)
                      Who knows and does not know that he knows - wake him Confucius)

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