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  • Jca50H / 100h/ 22h mod thread and owners club

    I say the main difference is a the pots are 1m instead of 500k making the jca sounding a bit darker and a 100k plate resistor for one of the loops stages. I'm going to work on the warren haynes mod, the depth mod, the scoop mod and the clean/ crunch mod an a couple of others. I'm also going to fix the layout of the thread soon. and some cosmetic mods too, I want to retolex in white snakeskin and I want to do a metal grill.

    The thread is a work in progress so check back often and don't be afraid to discuss and join in! What mods do you want to see?

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  • #2
    Mods

    Basic SLO Mod



    I'll add the crunch/clean switch, the bright switches and the scoop mod individually that way it doesn't overwhelm some one who just wants the basic aggressive stock s.l.o sound.

    Numbering is for the 50H

    The Predator mod



    A high gain metal mod for both channels. changes up the lead channel a bit and adds the sucker punch to the crunch channel. The change in r36 is optional.

    Numbering is for the 50h



    The sucker punch mod:

    r34= 680k

    c23=250pf

    This mod only affects the "crunch channel" not the lead channel

    The resistor numbers for this are for the 50h



    Simple clean channel:

    This is the less involved simple way to do it, for the beginner. You can make it switchable. basically you add a 39k resistor to ground after r42 an before the gain pot. I think dues has 68k in his and say it sounds "punchier".



    The resistor numbering is for the 50h





    Simple crunch channel:

    So you want more gain huh? replace r42 with a 470k resistor (Or solder another 1m resistor in parallel with the stock r42) and replace c28 with a 470pf cap ( i recommend a silver mica cap). There you go gainiac.



    The resistor numbering is for the 50H



    S.l.o. clean/crunch switch:

    Use a dpdt switch to put 470k resistor in series with another one making the total resistance close to 1m (aka the stock value) and adding a 39k resistor to ground. When the switch is activated the first 470k resistor is out of the circuit along with the 39k resistor to ground and you have a resistance of 470k aka the crunch mode. Same concept as the "simple" versions of this.



    The resistor numbering is for the 50h

    Decadence Mod

    Similar to the clean/crunch mod except this gives you a crunch AND a better clean channel.



    The resistor numbering is for the 50H

    Simple scoop mod

    The simple scoop mod is a basically a t-filter. You replace r34 with 2 1m resistors in series with a .001uf cap soldered from the middle of the resistors to ground.My version has a standard 22uf fenderish cathode bypass cap on r 45 and is switchable.





    Depth



    So basically Your looking at the pot exactly like this. the above just illustrates the resistor number for the nfb resistor and to what output jack you connect it to.





    also in case you have a 20h and want to join the fun here's the 20h mod thread.

    http://acapella.harmony-central.com/...nd-owners-club.
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    Comment


    • Promit
      Promit commented
      Editing a comment

      Are these the correct parts for the depth mod?

      OLY20006.jpg

      Attached Files

    • Greg_M
      Greg_M commented
      Editing a comment

      Does anyone have a gut shot of the inside a 50H with the decadance mod installed? 


    • slidedude
      slidedude commented
      Editing a comment

      How do you put a choke in the JCA 22?


  • #3
    Reserved in case more space is needed.
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    • #4
      interesting...what exactly does this sucker punch mod do to the sound?
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      • #5
        Haven't used my JCA in a band situation in a few months - took it to a jam session this weekend and killed it. Got some really killer tones and more gain than I could want for the radio rock songs we played.



        I am debating picking up one of the Peavey Vypyr 30 heads and a Sanpera for ease of use though - built in FX + modeling to use at home/leave at the practice space while the JCA I can save for when I need solid tone.

        Comment


        • #6
          SLO preamp circuit mod and KT66's were the best decision for my 100H. Really helped the lead channel a lot.



          clean channel right out of the box is really nice though.
          <div class="signaturecontainer"><b>Guitars</b><br />
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          <br />
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          Comment


          • #7
            I hadn't played my JCA50H in about a week, but when I went to the basement (My guitar room) I noticed that I had left my amp on

            Everything seems fine, but was wondering if it had any effect on my tubes since they had been on for a week straight. I also want to soon replace all of the tubes to warm the tone up a bit, what are the best tubes (that you guys have found) to warm this head up?

            Comment


            • #8






              Quote Originally Posted by Blakkwater
              View Post

              interesting...what exactly does this sucker punch mod do to the sound?




              More gain on the crunch channel and it break up quicker.







              Quote Originally Posted by cscbo1
              View Post

              I hadn't played my JCA50H in about a week, but when I went to the basement (My guitar room) I noticed that I had left my amp on

              Everything seems fine, but was wondering if it had any effect on my tubes since they had been on for a week straight. I also want to soon replace all of the tubes to warm the tone up a bit, what are the best tubes (that you guys have found) to warm this head up?






              I haven't had a chance to play around with tubes too much, just the stock chinese. I hear that a 12au7 in v1 make it sounds marshallish on the lead and super clean on the crunch channel.







              Quote Originally Posted by FastRedPonyCar
              View Post

              SLO preamp circuit mod and KT66's were the best decision for my 100H. Really helped the lead channel a lot.



              clean channel right out of the box is really nice though.




              How are the kt66s compared to 6l6s btw? Thats another change I'm interested in. Btw did zach change your pot values (for the gain controls) or did he keep them at 1m?
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              Comment


              • James2013
                James2013 commented
                Editing a comment

                Hi Edge,

                 

                Been reading about your mods for the JCA50 and want to have a go at your SLO mod. Never done this before although I have done repairs on my amps like fixing dry joints, re biasing and retubing - pretty basic stuff really. Anyway wonder if you could answer a couple of quick questions.

                 

                In your schematic c21 is a 470pF cap. Can't make out the replacement too well on my screen but think you say to replace it with 1nF cap (1 nano Farad I think). Is that right?

                 

                Also what caps will work best, silver mica perhaps? Any particular type of resistor best to use?

                 

                 

                 


            • #9
              all pots stayed the same. the KT66's have a little more open/less compressed bottom end and a bit more punch to the overall sound.
              <div class="signaturecontainer"><b>Guitars</b><br />
              Tokai LS150 - Sheptone Bryan Kahaek Signature pickups - Mystic Dream MM JP6 - G&amp;L Comanche<br />
              <br />
              <b>Amps - Cabs</b><br />
              Splawn <b>&quot;MUFASA&quot;</b> Nitro - Mako MAK4 Preamp - Jet City 100H w/JJ KT66's, 22H &amp; Pico Valve - Whitebox Engineering 2x12, PortCity OS212 - Splawn 4X12<br />
              <br />
              Kemper Profiling Amp - u mad?<br />
              <br />
              <b><a href="http://www.netmusicians.org/index.php?section=user&amp;value=FastRedPonyCar" target="_blank">Visit my music page</a></b><br />
              <br />
              <b><a href="http://www.youtube.com/FastRedPonyCar" target="_blank">Watch my amp demo videos on Youtube</a></b><br />
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              Comment


              • #10






                Quote Originally Posted by OceansBetweenUs
                View Post

                Haven't used my JCA in a band situation in a few months - took it to a jam session this weekend and killed it. Got some really killer tones and more gain than I could want for the radio rock songs we played.



                I am debating picking up one of the Peavey Vypyr 30 heads and a Sanpera for ease of use though - built in FX + modeling to use at home/leave at the practice space while the JCA I can save for when I need solid tone.




                I have both the JCA100H and Vypyr 30 head. I think you'll be surprised at how loud the Vypyr 30 can get, yet still sound as good as it does at lower volumes.
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                • #11
                  My 22h should be here by early next week. Really excited to try it out with my Blackstar.
                  <div class="signaturecontainer"><div class="bbcode_container">
                  <div class="bbcode_quote">
                  <div class="quote_container">
                  <div class="bbcode_quote_container"></div>

                  <div class="bbcode_postedby">
                  <img src="images/misc/quote_icon.png" alt="Quote" /> Originally Posted by <strong>DunwichAmps</strong>
                  <a href="showthread.php?p=47368751#post47368751" rel="nofollow"><img class="inlineimg" src="images/buttons/viewpost-right.png" alt="View Post" /></a>
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                  <div class="message">meh. more fuzz and dist</div>

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                  • #12
                    Easiest mod...

                    Change out the tubes and set the bias properly.



                    Outside of that, my JCA22H sounds fine stock. Even takes pedals well (Hardwire delay/chorus/reverb in the loop, overdrive / poly tuner in front)
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                    • #13






                      Quote Originally Posted by jenksdrummer
                      View Post

                      Easiest mod...

                      Change out the tubes and set the bias properly.



                      Outside of that, my JCA22H sounds fine stock. Even takes pedals well (Hardwire delay/chorus/reverb in the loop, overdrive / poly tuner in front)




                      Thats always a good modification.



                      Ok guys I digitalized most of my mod notes for the "slo" mod. The schematic is really misdrawn so I'm going to confirm 2/3 with my multimeter soon and release it.
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                      • #14






                        Quote Originally Posted by jenksdrummer
                        View Post

                        Easiest mod...

                        Change out the tubes and set the bias properly.



                        Outside of that, my JCA22H sounds fine stock. Even takes pedals well (Hardwire delay/chorus/reverb in the loop, overdrive / poly tuner in front)




                        Do the hardwire pedals work with all of the Jet City heads' FX loops?

                        Comment


                        • #15






                          Quote Originally Posted by OceansBetweenUs
                          View Post

                          Do the hardwire pedals work with all of the Jet City heads' FX loops?




                          From what I've read...no.



                          The only one I can confirm is the JCA22H. I'm not sure if the 100H/100HDM/50H does or not. Seems there's a thread around here where someone from Jet City says the loop was done differently for the 22H due to complaints...which I don't know if that includes all previous models or not. Seems most Soldano and Soldano-designed amps have the same issue with loops that don't work quite right with pedals.
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