New Jet City Amelia 50 Watt Head.

Discussion in 'Other Amps' started by chromeboy, Jan 1, 2017.

  1. BowerR64

    BowerR64 Well-Known Member

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    My complaint about the JCA50H was that it was way to gainy, even on the crunch channel it was way to heavy for me.

    Im wanting a more classic clean/edge of break up tone but still want something that has the 80s classic rock overdrive.

    Even if channel one cant do the edge of breakup thing if its clean an OD pedal can be used atleast.

    This guy got some decent tones from it i though

     
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  2. johnfv

    johnfv Well-Known Member

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    FWIW, I'm playing vintage output pickups and Channel 1 will start to breakup a bit at around 3/4 volume. I'm using a compressor and I've never cranked it much beyond that as I am *trying* to keep it clean :) With hot pickups I'm sure you could get more out of it.
     
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  3. stringtree

    stringtree Well-Known Member

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    No ones experienced any problems with the effects loop as in the video below.......

    When the pedal in the loop is activated, it bumps up the volume. He tried 2 different pedals, same result.

    Or is this just user error on his part by not adjusting the volume of said 2 pedals...

     
  4. Trident

    Trident Well-Known Member

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    Are these amps cathode or need to be biased?
    This amp does have my attention....
     
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  5. johnfv

    johnfv Well-Known Member

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    IMHO, they are a bit misleading about this. There is a bias trim pot inside and it should be adjusted as needed. They default to a rather cold bias and the amp still sounds pretty damn good regardless. Put your favorite tubes and bias properly and *truly* enjoy.
     
  6. Trident

    Trident Well-Known Member

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    Might have to dig a bit deeper and try one out!
    They look and from youtubes they sound pretty good...
    Thanks for the info..
     
  7. BowerR64

    BowerR64 Well-Known Member

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    So who the hell designed it? I thought it was a rehash of the Soldano with the 2 channels rolled back a little so they wernt so gainy and an improved effects loop?

    This is the demo that made me want it, if you watch the video IMO its a different amp then what i have. Mine doesnt appear to have any mods either.

    In the first part of the video hes getting a classic break up with the ch1 volume at noon, it sounds very marshally in this video

     
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  8. BowerR64

    BowerR64 Well-Known Member

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    Dang i think maybe i got the wrong model.

    I got the Earnhardt, to much uhhh OVERDRIVE!

    Earnhart 2.jpg
     

    Attached Files:

  9. Tobias Klare

    Tobias Klare New Member

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    Hello Johnfv! Where is this bias trim pot? Is it, where the tubes are, or do I have to take the whole “thing“ out?
    I own this amp, but can't find much information.
    Bye the way...hello forum, I'm new here.
     
  10. ampmadscientist

    ampmadscientist Well-Known Member

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    Start the reactor... Free Mars!
    Welcome to the forum Tobias :cheers:.
     
  11. South Park

    South Park Well-Known Member

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    Greetings from cal your amp is a slo 100 clone . It has a bias pot for the drivers. The pre amp tubes are fixed bias . The one stage is a cold clipper.
     
  12. Tobias Klare

    Tobias Klare New Member

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    Hello Southpark!
    THX for your answer. I try to repeat, what I understand, because my English is not that good.
    1. I don't have to do anything with the bias if we talk about preamp tubes?
    2. But I have to do something for the other tubes?
    I don't understand the sentence with "the cold clipper"
     
  13. South Park

    South Park Well-Known Member

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    The bias on the preamp tubes are good. The power tubes get re bias if you replace them . The bias is set low on one stage of the preamp tubes that is what is called cold clipping .
     
  14. Tobias Klare

    Tobias Klare New Member

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    And where is that bias pot for the power tubes? And what do you mean with "stage"?
     
  15. South Park

    South Park Well-Known Member

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    The bias pot is on the circuit board. The guitar signal goes from one preamp tube to another in a chain then goes to the power tubes. Each stage does something different . Like tone shaping and gain
     
  16. Tobias Klare

    Tobias Klare New Member

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    Okay. Thank you. Now I have better picture of the whole thing.
    Do you know, which reading, would be needed for the power section? Of course I know, that there is not only one reading.
     
    Last edited: Nov 29, 2019
  17. South Park

    South Park Well-Known Member

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    Look up info on slo 100 . Mike Soldano built that amp is a clone. The power section is the same as the 2204
     
  18. johnfv

    johnfv Well-Known Member

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    As others have mentioned:
    Welcome to the forum!
    The bias trim pot is inside on the circuit board.


    I happen to have a picture from when I was doing some mods, the trim pot is circled in yellow:
    AmeliaBiasTrim.jpg
     
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  19. Tobias Klare

    Tobias Klare New Member

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    Thank you very much, Johnfv. And what Reading should the bias have? So to say "between which borders"?
     
  20. Tobias Klare

    Tobias Klare New Member

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    Thank you, Marshallforum. I managed to adjust the bias new.
    Great to have infos from people who know some things.
     

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