The JV14, 14watt joint venture amp build final pics

Discussion in 'Building the Classics' started by Guitar-Rocker, Nov 30, 2021.

  1. Guitar-Rocker

    Guitar-Rocker Well-Known Member

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    So here is the final build thread for the 14watt joint venture amp build. The amp is electrically done on my end, ready to play. All that I had left after this posting is to stuff the chassis into the new head shell, then deliver this amp to David Hopkins to apply one of his mods.

    I received the front/rear plates from Sandy at Precision Design, and mounted those. Here are a few pics. There are a couple of slight changes from my earlier thread about the build started. Also for those first time viewers, the pcb came from Headfirst. Pics below.


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  2. Guitar-Rocker

    Guitar-Rocker Well-Known Member

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    The amp is mounted in the head cabinet, which came from Mojotone (via TubeDepot). And I drilled out the rear panel mounting holes to accept the threaded inserts, so now the panel goes off/on by machine screw instead of a wood screw. And I have the first coat of black paint applied to the rear of the reverse engraved amp badge. After that gets another coat and dries, I'll take a final set of pics, then it goes into the packing box until I get to David's house.



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  3. PelliX

    PelliX Well-Known Member

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    Sweet :drool:, nice work! The tolex needs a spot of glue on the left at the back and the board could do with a little cleaning, but that's 10 minutes tops. My only real criticism would be the corner pieces - they just don't look to fit too well...

    Changes nothing about how it sounds, of course. :thumb:

    Also, quick question, the hole at the back for the AC mains receptacle - it looks like it's too large or the wrong shape. Was it originally intended to go on the inside, perhaps?
     
  4. South Park

    South Park Well-Known Member

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    I’m looking for a PCB for a 2204 did you a wire layout for that board . Nice job
     
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  5. Guitar-Rocker

    Guitar-Rocker Well-Known Member

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    The Headfirst PCB board that I used can be configured as either a 1959/1987 plexi, or as a 2203/04.
     
  6. Gene Ballzz

    Gene Ballzz Well-Known Member

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    Very nice that you included a "Plate" Voltage" probe point that many folks don't! How was it working with that PC board? It look like you were able to accomplish the soldering of components from the top of the board? Is that the intention of the design and could that soldering be done from above or below, depending on preferenc? I'd love to see pics of both the top and bottom of the board, especially un populated, if youhave them.

    Great Work, As Always!
    Gene
     
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  7. Guitar-Rocker

    Guitar-Rocker Well-Known Member

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    The pads go all the way through, so soldering can be from either side. The only trying thing with the boards is the removal of the flux splatter. Usually 91% isopropel works excellent, but it seems to disperse flux staining wider than before when using Q-tips, and is hard to remove it all in an effort to "try to make it purdy".
     
    Last edited: Nov 30, 2021
  8. Sapient

    Sapient   Silver Supporting Member Gold Supporting Member

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    That looks awesome, OP. Those gold covers add a ton to the hot looks factor for sure.
     
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  9. printer

    printer Active Member

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    So EL84?
     
  10. Guitar-Rocker

    Guitar-Rocker Well-Known Member

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    Actually 6CM6 which is a 9 pin version of a 6V6
     
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  11. printer

    printer Active Member

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    Nice looking amp. I picked up a bunch of 12AB5's way back when before I heard of the 6CM6.
     
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  12. burger

    burger Active Member

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    Nice job, great to see the board put to excellent use! How's it sound?
     
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  13. Guitar-Rocker

    Guitar-Rocker Well-Known Member

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    Like a 14 watt 2203. I really liked the options that your board allows, and the ruggedness of allowing swaps on the board without effecting the solder pads. I went with a dual can cap for the first two reservoir filters, and radials for the other three. I'm sure the board would allow for many types of projects that could be built. Nice job on the design.

    And for those considering using one of these boards, this build is dead silent at idle. So great job at spacing the traces correctly.
     
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  14. Guitar-Rocker

    Guitar-Rocker Well-Known Member

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    Final photo before it goes into the cardboard box to travel north with us. Next stop is at David Hopkins on the 15th

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  15. PentodeLicious

    PentodeLicious Member

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    WOW looks beautiful and very clean!
    :applause:
     
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  16. Gene Ballzz

    Gene Ballzz Well-Known Member

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    Simply GOJUS, on all levels!
    :thumbs::thumbs:
    Gene
     
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  17. Guitar-Rocker

    Guitar-Rocker Well-Known Member

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    A round up of parts:

    Modulus Chassis
    Hammond 270DAX PT
    ClassicTone Choke 40-14058 3HY
    ClassicTone OT 40-18037 8K Pri
    Granger FX loop
    Belton Sockets
    CTS pots
    F&T can cap 50uF/50
    Carling Off-Standby-On switch
    Cliff Jacks
    Headfirst Amplification board
    Draloric vintage resistors
    Dale resistors
    Vishay resistors
    ERO vintage caps
    ValveStorm Wire
    Mojotone head cabinet, via TubeDepot
    JJ preamp 12AX7's
    Old stock Sylvania 12AX7
    Old stock 6CM6 tubes
     
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  18. Guitar-Rocker

    Guitar-Rocker Well-Known Member

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    So the amp is now at David’s house for the mods to be done. I did record a clip of David seeing what it would do in stock form. I’ll post it as soon as I can.
     
  19. Guitar-Rocker

    Guitar-Rocker Well-Known Member

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    And a sound clip from my Iphone, after the amps delivery. Non rehearsed.

     
  20. NewReligion

    NewReligion Well-Known Member VIP Member

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    I am both humbled & honored that Terry asked me to look up the girls skirt and do what it is I do.

    Indeed I feel this JV14 watt 6CM6 powered stock 2204/2203 preamp values smoked the more than several hundred actual Marshall 2204/2203’s that came across my bench.

    No excuses on my poor performance. Hand surgery, then a six week battle with “Flu”.

    I will indeed post a pre/post comparative video when finished which will need no OD pedal.

    David
     
    Last edited: Dec 19, 2021

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