Jcm800 2204 Build

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

  1. coolidge56

    coolidge56 Well-Known Member

    Joined:
    Jan 30, 2019
    Messages:
    347
    Likes Received:
    755
    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

    Joined:
    Jun 26, 2014
    Messages:
    14,840
    Likes Received:
    8,705
    Location:
    Start the reactor... Free Mars!
    What are the 200 volt caps for?
     
  3. coolidge56

    coolidge56 Well-Known Member

    Joined:
    Jan 30, 2019
    Messages:
    347
    Likes Received:
    755
    Are you asking about those .68u caps?

    [​IMG]
     
    neikeel likes this.
  4. Yugedrums

    Yugedrums Well-Known Member

    Joined:
    May 7, 2015
    Messages:
    344
    Likes Received:
    263
    Location:
    South Carolina
    Subscribed. :hmm:
     
  5. mickeydg5

    mickeydg5 Well-Known Member VIP Member

    Joined:
    Sep 30, 2011
    Messages:
    23,221
    Likes Received:
    10,312
    Location:
    US of A
    What are all the little black boxes? Mouse traps?

    (Its joke)
     
  6. coolidge56

    coolidge56 Well-Known Member

    Joined:
    Jan 30, 2019
    Messages:
    347
    Likes Received:
    755
    When two black holes merge they absorb the gravity waves and sweeten the reverb.
     
  7. ampmadscientist

    ampmadscientist Well-Known Member

    Joined:
    Jun 26, 2014
    Messages:
    14,840
    Likes Received:
    8,705
    Location:
    Start the reactor... Free Mars!

    You have rectangular filter caps?
     
  8. coolidge56

    coolidge56 Well-Known Member

    Joined:
    Jan 30, 2019
    Messages:
    347
    Likes Received:
    755
  9. mickeydg5

    mickeydg5 Well-Known Member VIP Member

    Joined:
    Sep 30, 2011
    Messages:
    23,221
    Likes Received:
    10,312
    Location:
    US of A
    yes, DC-Link capacitors
     
  10. ampmadscientist

    ampmadscientist Well-Known Member

    Joined:
    Jun 26, 2014
    Messages:
    14,840
    Likes Received:
    8,705
    Location:
    Start the reactor... Free Mars!
    Last edited: Mar 23, 2019
  11. coolidge56

    coolidge56 Well-Known Member

    Joined:
    Jan 30, 2019
    Messages:
    347
    Likes Received:
    755
    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.
     
    Hgvhgvyvutvy, syscokid and mAx___ like this.
  12. coolidge56

    coolidge56 Well-Known Member

    Joined:
    Jan 30, 2019
    Messages:
    347
    Likes Received:
    755
    Those look sweet. Sadly I don't see a supplier for them here in the USA.
     
  13. junk notes

    junk notes Active Member

    Joined:
    Dec 10, 2018
    Messages:
    206
    Likes Received:
    190
    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

    Joined:
    Jan 30, 2019
    Messages:
    347
    Likes Received:
    755
    First build with film filter caps so we'll see how this turns out tone wise.
     
  15. ampmadscientist

    ampmadscientist Well-Known Member

    Joined:
    Jun 26, 2014
    Messages:
    14,840
    Likes Received:
    8,705
    Location:
    Start the reactor... Free Mars!
    [​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

    Joined:
    Jan 30, 2019
    Messages:
    347
    Likes Received:
    755
    Link to that cap?
     
  17. FourT6and2

    FourT6and2 Active Member

    Joined:
    Dec 3, 2010
    Messages:
    472
    Likes Received:
    242
    Interesting. Looking forward to seeing how this turns out.
     
  18. ampmadscientist

    ampmadscientist Well-Known Member

    Joined:
    Jun 26, 2014
    Messages:
    14,840
    Likes Received:
    8,705
    Location:
    Start the reactor... Free Mars!
    Last edited: Mar 31, 2019
    mAx___ likes this.
  19. coolidge56

    coolidge56 Well-Known Member

    Joined:
    Jan 30, 2019
    Messages:
    347
    Likes Received:
    755
    Turret/PCB first draft.

    Preamp 90 x 330 mm

    [​IMG]

    Power Supply 100 x 160 mm

    [​IMG]
     
    Amadeus91 likes this.
  20. clutch71

    clutch71 Well-Known Member

    Joined:
    Sep 26, 2007
    Messages:
    1,500
    Likes Received:
    919
    Location:
    Columbus, Ohio
    In for the build process. Appears your making your own PCB? I'd like to hear more about that.
     

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice