Finally! JMI style Vox AC15 build

Discussion in 'Shock Brother's DIY Amps' started by gusfinley, Nov 21, 2019.

  1. gusfinley

    gusfinley Tele-Holic

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    I've been planning this build for around two years.

    My "Dream Vox amp"

    - AC15 Power stage with Top Boost and Normal Channels
    - Cut Control
    - Master Volume
    - Pentode/Triode Strip
    - JMI Era Construction!
    - Premium parts ( Mercury/Heyboer Transformers, Phillips Mustard/Wima Caps, Mullard Amparex Tubes)
    - Weber Alnico Blue Dog
    - Official Vox-Licensed JMI Era AC15 cabinet

    I previously considered a build like this impossible, but everything fell into place at the right time.

    I plan to start next week during Thanksgiving Vacation - if I can wait that long.



    A one-way discussion about it here:

     
  2. Snfoilhat

    Snfoilhat Tele-Afflicted

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    This is shaping up to be something special.

    Would you share your source for that style of tag board, please? I've only gotten my hands on a couple after parting out an organ and a ton of desoldering. I would be glad to be able to buy them new.
     
  3. gusfinley

    gusfinley Tele-Holic

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    I don't have the part number on hand at the moment, but Allied Electronics and RadioSpares are in cahoots now, so we can get Radio Spares (RSpro) components without international shipping rates!
     
    Last edited: Nov 22, 2019
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  4. NSB_Chris

    NSB_Chris Tele-Meister

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    Very interesting chassis configuration! I am not familiar with that amp. Can you show how that chassis fits into the cabinet.
     
  5. gusfinley

    gusfinley Tele-Holic

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    Well, I got a jumpstart on this project!

    I made the final arrangements on the chassis, verifying the components fit from the 3D model with the actual hardware.

    I had to drill holes for the Fuse Block, cinch-style tag strips, Euro-style barrier strip/terminal block, axial capacitor mounts, etc.

    Here is the final assembled product ( minus electrical components )



    I've got a video uploading to youtube that I'll add to this post later.
     
  6. milocj

    milocj Friend of Leo's Ad Free Member

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    If you look at his first picture you can see that there's a flange at the bottom with three holes in it. The chassis screws down through these onto a "slider board" which is just a piece of wood that is a bit wider than the chassis and the same depth as the cabinet.

    The cabinet will have a groove in it created by two cleats on each side. The slider board slides into the groove just like a shelf would into an entertainment center or an armoire and the height is just right so that the top of the control panel will touch the inside top of the cabinet. Once the back panel is screwed on the whole thing is held in place.

    A little difficult to describe but very some when you see it done.
     
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  7. gusfinley

    gusfinley Tele-Holic

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    Here is the video with a tour of the chassis:

     
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  8. gusfinley

    gusfinley Tele-Holic

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    Got the heaters wired up!

    The tubes are glowing!

     
  9. Mongo Park

    Mongo Park Tele-Holic

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    74C7689A-C989-4DDE-9A97-8C619DCBBD9F.png You can buy those tag strips on eBay.
     
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  10. gusfinley

    gusfinley Tele-Holic

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  11. gusfinley

    gusfinley Tele-Holic

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  12. gusfinley

    gusfinley Tele-Holic

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    Tagboards are being loaded. I worked up this jig so I wouldn't have to fight the pots and wires that are in the chassis.

    Unfortunately, I found I used my 1/2 watt 1Meg resistors on the input jacks instead of the 1/4 watt 1 meg resistors. I'll need to order a few more before I can complete the tagboards.

     
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