JTM Clubman New 18 Watt Amp With Vintage Parts

Discussion in 'Building the Classics' started by pleximaster, Nov 20, 2019.

  1. pleximaster

    pleximaster Well-Known Member

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    Beautiful built Neikeel as always! I initially started with that same layout! But tweaked it from there. And you are right it is more or less a rip off of Watkins Dominator.

     
  2. tomsvintage

    tomsvintage Well-Known Member

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    Built by pleximaster with 1960's components and parts





    Much thanks and appreciation to my friend pleximaster for all that you do !!!!!!!!
     
    Last edited: Jan 19, 2020
  3. South Park

    South Park Well-Known Member

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    Great tone . I really like that chime sound you get with those el84s with the right gain it sounds great .
     
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  4. pleximaster

    pleximaster Well-Known Member

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    clubman custom.jpg 7fbpCl1MRHKhsMYOdYGPBw_thumb_26a1.jpg CC b.jpg I have a few projects (Restorations and and builds) going on and while sourcing parts I start new ones... :) Here is a new one inspired by the Clubman. This will be a a 18 watt two channel but without tremolo. Will make a similar small head box as for the other Clubman I made for Tom and me (My Clubman is soon done waiting for some parts and valves) Will make Clubman speaker cabs as well

    This new Clubman (Custom) I build on an old 63 Concord Linear chassis... Still trying out layout...
     
    Last edited: Jan 27, 2020
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  5. pleximaster

    pleximaster Well-Known Member

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    Will be interesting to see how this one will work out. I have stolen/borrowed many classic designs from all over, however, will they work out together? I am after a compact build at the same time using oversized vintage components (1-2 watt resistors for instance, Ken Fischer supported oversized resistors for tone)

    plexi

    IMG_5864.jpg
     
    Last edited: Feb 2, 2020
  6. pleximaster

    pleximaster Well-Known Member

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    Now I regret not making a schematic and just tried to keep all in my head instead, hard when you pause in a build...

    plexi 9657BB26-34EF-4F0E-B212-9134F7540CE9.jpeg 06D9124A-B6DD-4E41-96A4-0AF2C6D2F8D0.jpeg
     
  7. pleximaster

    pleximaster Well-Known Member

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    Front

    input for the two channels (will be switchable using an external a/b box (less wires inside)

    above these are volume and tone for jtm/JMP plexi type of channel

    then there is a wreck like channel with TMB

    nfb circuitry build in

    I have been inspired by the mhuss T-Rex amp

    best plexi 80A6EF4E-4F4B-45AE-BE6F-89B03B8081F4.jpeg
     
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  8. pleximaster

    pleximaster Well-Known Member

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    I am really keen to know how the Original Concorde Linear Output transformer will work out in this design. It’s a hit or miss I think. You always hear that ultra linear transformers shouldn’t be used in guitar amps. however I got a few early 60 script logo Carlsbro combos and they all are wired using ultra linear options and they sound soo good!

    9E904D05-DA68-47DF-8618-E16390AB1DEA.jpeg
     
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  9. pleximaster

    pleximaster Well-Known Member

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    update!
    As you can see from the long test wirings, I am already rebuilding this one. I finally put in the last wires yesterday but it didn't sound as I wanted it to. Had this great design prepared in my head but reality and hubris hit me and now I have to rethink this one... :) :) :)

    I won´t stop trill it sound good! ;)

    plexi


    IMG_5946[1].jpg


    I might be some miss calculations as I combined two types of preamps, a cathode bias, no choke and ultra linear OT making the voltages off respectively...

    ...meditate on this I will... (Yoda)
     
    Last edited: Feb 11, 2020
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  10. pleximaster

    pleximaster Well-Known Member

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    Still scratchat my head with this build...

    cant get both “preamps” to sound good with the output stage. Either the “plexi” sounds good or the “Fischer” one...

    I accidentally sapped myself real good using too many test wires at once and one hit the chassis as I poked around...

    Zzzzzappp!

    Plexi
     
  11. neikeel

    neikeel Well-Known Member

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    ouch!
     
  12. pleximaster

    pleximaster Well-Known Member

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    Yes Ouch!!!

    I think however I am starting to sort things out with different preamp voltages for the two channels. I have to test it out a bit more and then tidy it up. Still have several dangerous long test cables and now the board and pots are hanging in the air! ;) ;) ;)

    Won´t post pictures! What a mess! Haha! :)
     
  13. pleximaster

    pleximaster Well-Known Member

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    In this amp I am trying to built a two channel 20 watt-ish Clubman with one jtm channel and one Fisher/ trainwreck inspired one, where you can go from clean to metal with just the turn of the volume on the guitar. I had a few design flaws (still a few to correct/optimise)

    I have change quite a few values from my initial design and this have resulted in temporary long wires that makes the amp noisy at the moment. I also hear a ground loop that I’ll try to eliminate. At the moment I am just glad I got the clean to metal thing going, just using the guitar knobs.

    As mention before I build this in a concord linear hifi amp using the OT in ultra linear mode. Guitar is old Les Paul with original PAFs 7.2k 7.8k No high gain pickups.

    A good friend of mine thought it reminded of the "Slash tone" and I take that as a compliment! :)


     
    Last edited: Feb 18, 2020
  14. neikeel

    neikeel Well-Known Member

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    Seems to hit most of the necessary spots!:headbanger:
     
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  15. tomsvintage

    tomsvintage Well-Known Member

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    Excellent !!!!
     
  16. shakti

    shakti Active Member

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    Very cool! What cab/speakers?
     
  17. pleximaster

    pleximaster Well-Known Member

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    t652 Celestion alnico!
     
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  18. pleximaster

    pleximaster Well-Known Member

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    I am making some "Clubman" cabinets for the Clubman and decided to voice them all for Celestion alnicos

    plexi
     
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  19. pleximaster

    pleximaster Well-Known Member

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    I got rid of the ground loop hum today! :) More or less star grounded everything only two points.

    Still have some noice but since its a sort of a train wreck design I guess it wound be that quiet... (I never owned a real train wreck but I heard they are not super quiet designs) Any input and experience on this would be appreciated! :)

    Will make a new sound slip soon (But the kids are off to bed...)

    It is really cool on the wreck channel now as you go from totally clean to over the top gain with just the volume control on the guitar.

    Not 100 % balance yet between the JTM channel and the Wreck... The JTM preamp section should be go in a bit stronger into the power amp... ;)

    Description
    Power amp is inspired by a 1962 Carlsbro CS40 (Ultra linear setup)
    JTM channel is inspired by the 1 watt 50th anniversary JTM1
    TrainWreck channel inspired by Trainwreck express and Mark Huss T-Rex amplifier

    Built on a Concord Linear amp chassis with old transformers and parts

    plexi



    plexi
     
    Last edited: Feb 24, 2020
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  20. pleximaster

    pleximaster Well-Known Member

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    I have now put shielded wires to all grids in the preamp, it is very quite now but it has lost some sparkle, I am considering trying to shift and increase some of the upper highs by increasing the values on a few caps but first some tube/valve rolling...

    plexi
     

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