New handwired Vox AC4 day

Discussion in 'Glowing Bottle Tube Amp Forum' started by milocj, Dec 26, 2018.

  1. milocj

    milocj Friend of Leo's Ad Free Member

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    Bought it for myself for my birthday.

    IMG_20181226_190655.jpg IMG_20181226_190655.jpg IMG_20181226_190711_1.jpg
     
    greenhornet, Dukex, jtcnj and 5 others like this.
  2. milocj

    milocj Friend of Leo's Ad Free Member

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    Picture1.png


    Of course this isn't the one you can just grab at GC or online. :)
     
    blakestree, Snfoilhat and tery like this.
  3. djh22

    djh22 Tele-Holic

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    Congrats and Happy B-day!
     
  4. MickM

    MickM Friend of Leo's Ad Free Member

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    Where can you "grab" one. I need a nice upstairs amp.
     
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  5. alathIN

    alathIN Tele-Holic

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    I keep thinking I should convert my ac4 c12 - keep the box but build a new amp to go in it.

    Interesting how the on/off is on the tone knob on yours.
     
  6. tery

    tery Poster Extraordinaire Silver Supporter

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    Happy Happy Birthday :)
     
  7. milocj

    milocj Friend of Leo's Ad Free Member

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    Not really sure why they did that. I just checked the schematic and the tone and volume both use the same value pot, but who knows what they were thinking back in 1964 when they made it. The EF86 preamp tube brings a nice twist to the low watt amps.
     
  8. gusfinley

    gusfinley Tele-Holic

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    Nice! That's a lucky find there!
     
  9. gusfinley

    gusfinley Tele-Holic

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    It can be done! I converted my AC4C1-BL into a handwired circuit. It would be easier with the AC4C1-12 and it's larger cabinet.
     
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  10. corliss1

    corliss1 Friend of Leo's Platinum Supporter

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    Nice! Now go get it serviced :D
     
  11. milocj

    milocj Friend of Leo's Ad Free Member

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    Yep. Trying to figure out if there's a drop-in replacement for the 32/32uf @ 350v cap can, otherwise I have a Ruby that will work with some zip ties or silicone.
     
  12. corliss1

    corliss1 Friend of Leo's Platinum Supporter

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  13. alathIN

    alathIN Tele-Holic

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    I didn't know it was an EF86.
    My Vox-inspired Trinity amp has an EF 86 channel and I love it.
    What is the headroom/clean tone like on yours? My Trinity's EF86 channel is pretty crunchy from the get-go.
    Do you have the model info? If you could post a copy of the schematic that would be awesome.
    I'm guessing from ''speed' yours has tremolo. How does it sound?
     
    Last edited: Dec 27, 2018
    asnarski likes this.
  14. alathIN

    alathIN Tele-Holic

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  15. Snfoilhat

    Snfoilhat Tele-Afflicted

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    Really cool amp. Looks like this is close.
    ac4.jpg
     
  16. Dukex

    Dukex Tele-Holic

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    Congrats on a great find. Have a blast!
     
  17. MadJack

    MadJack Friend of Leo's Silver Supporter

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    That's the '64(?) and later JMI AC4. The circuit goes back to the original 1958 AC, with mainly cosmetic differences through the years.

    Beautiful example. I plan to eventually build one for myself.
     
  18. milocj

    milocj Friend of Leo's Ad Free Member

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    Snfoilhat got the right schematic. Mine's a '64. They were all pretty similar even though JMI called them an AC2 at first, followed by the AC6 before settling on AC4. I think the only big change was the location of the tone control in the circuit.

    The tremolo is alright with the biggest issue as to not being able to set the depth. That makes the slowest settings awfully "throbby".

    Headroom is surprisingly good, at least with my Teles which don't have very hot pickups. With those and the amount dimed it gets about as dirty as most of Cropper's stuff that he used the Harvard on: just starting to get a little crunch to it. Surprisingly loud, as well, and all with the original 8" Elac and all the original electrical bits. I think the only thing that isn't original is the VOX emblem.

    Not a whole lot of these out there anymore.
     
    Last edited: Dec 27, 2018
    alathIN likes this.
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