Jcm800 2204 Build

Discussion in 'Building the Classics' started by coolidge56, Mar 22, 2019.

  1. coolidge56

    coolidge56 Well-Known Member

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    I purchased my first JCM800 recently the new Studio SC20H. Kind of fell in love with the little 20 watt's tone so for fun I have decided to scratch build a 2204 50 watt.

    The first batch of components arrived lets have a look.

    Mercury Magnetics power transformer P50JM-475.
    Mercury Magnetics output transformer 050JM.
    Mercury Magnetics choke MMC-3H.
    Vishay BC 100,000 hour Polypropylene film filter caps, 5% tolerance.
    Synergy Royal Mustard USA signal caps.
    OHMITE 5W wire wound resistors.

    Film caps continue to shrink in size. I have these drawn on the PCB/turret board and they fit fine.

    [​IMG]

    Top view

    [​IMG]

    Side view. The 50 watt power transformer is the same size as a 100 watt.

    [​IMG]

    Comparing the size of the output transformer, here is a 100 watt on the left vs the 50 watt on the right.

    [​IMG]

    This will be the first time I have used these Synergy Royal Mustards. Fingers crossed.

    [​IMG]

    Digi-key misrepresented these TE Connectivity 3W power resistors on their site. I may go with a different brand.

    [​IMG]

    Next I'll continue work on the CAD for the PCB/turret board.
     

    Attached Files:

  2. ampmadscientist

    ampmadscientist Well-Known Member

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    What are the 200 volt caps for?
     
  3. coolidge56

    coolidge56 Well-Known Member

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    Are you asking about those .68u caps?

    [​IMG]
     
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  4. Yugedrums

    Yugedrums Well-Known Member

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    Subscribed. :hmm:
     
  5. mickeydg5

    mickeydg5 Well-Known Member

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    What are all the little black boxes? Mouse traps?

    (Its joke)
     
  6. coolidge56

    coolidge56 Well-Known Member

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    When two black holes merge they absorb the gravity waves and sweeten the reverb.
     
  7. ampmadscientist

    ampmadscientist Well-Known Member

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    You have rectangular filter caps?
     
  8. coolidge56

    coolidge56 Well-Known Member

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  9. mickeydg5

    mickeydg5 Well-Known Member

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    yes, DC-Link capacitors
     
  10. ampmadscientist

    ampmadscientist Well-Known Member

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    Last edited: Mar 23, 2019
  11. coolidge56

    coolidge56 Well-Known Member

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    Yep the future has arrived. The amp basically will never need to be re-capped. If someone played the amp 2 hours a day 5 days a week it will be 200 years before the caps need to be replaced. ESR/ripple is a tiny fraction vs electrolytic. Less ESR less heat. 5% tolerance. Higher voltage rating etc.
     
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  12. coolidge56

    coolidge56 Well-Known Member

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    Those look sweet. Sadly I don't see a supplier for them here in the USA.
     
  13. junk notes

    junk notes Well-Known Member

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    very cool, 56 ;-). Always nice to see a build populate.

    Yes those caps sound hi-fi in their info. Which is what you probably want in an audiophile build.
     
  14. coolidge56

    coolidge56 Well-Known Member

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    First build with film filter caps so we'll see how this turns out tone wise.
     
  15. ampmadscientist

    ampmadscientist Well-Known Member

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    [​IMG] Digikey has 20uF 700 V 105C rated 100000 hours at 70C for $11.20 80uF $32.98

    I like the specs, that sounds like something I could use....

    * lifetime rating of a standard filter cap is typically 5000 hours at rated temperature.
    This cap is supposed to last like 20 times longer.
     
    Last edited: Mar 30, 2019
  16. coolidge56

    coolidge56 Well-Known Member

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    Link to that cap?
     
  17. FourT6and2

    FourT6and2 Well-Known Member

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    Interesting. Looking forward to seeing how this turns out.
     
  18. ampmadscientist

    ampmadscientist Well-Known Member

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    Last edited: Mar 31, 2019
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  19. coolidge56

    coolidge56 Well-Known Member

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    Turret/PCB first draft.

    Preamp 90 x 330 mm

    [​IMG]

    Power Supply 100 x 160 mm

    [​IMG]
     
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  20. clutch71

    clutch71 Well-Known Member

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    In for the build process. Appears your making your own PCB? I'd like to hear more about that.
     

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