My project "JLH-69"

Discussion in 'DIY' started by Zampotech, Feb 8, 2019.

  1. mdr30

    mdr30 Rando

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    I'm a bit confused regarding discussions of power/headphone amps in this thread, but if you have a JLH germanium headphone amp going (kit or finished) I would certainly be interested. My SW51 is doing excellent service.
     
  2. Zampotech

    Zampotech Friend

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    A small update to this forgotten theme. The day before yesterday, we received a long-awaited batch of printed circuit boards, including boards for the JLH-69 power amplifier

    [​IMG]

    There are no ready-made amplifiers now. There is only a prototype. The production of amplifiers on germanium transistors was frozen due to the lack of the possibility of manufacturing cases.
    Now I have the opportunity to make cases, and this project will be unfrozen.
     
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  3. Cspirou

    Cspirou They call me Sparky

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    oooooooo

    I assume PCBs are available for sale?
     
  4. Zampotech

    Zampotech Friend

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    I think this project can be open and anyone can order these printed circuit boards. Direct delivery from the manufacturer is likely to be cheaper

    Link to order directly from the manufacturer.

    Of course, this is for amateurs who know which side to take the soldering iron from:)

    PS I will provide the layout of the elements and the electrical diagram a little later.
     
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    Last edited: Mar 18, 2021
  5. Sqveak

    Sqveak Friend

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    What kind of pricing are you aiming for with the MAGISTER?

    Is it possible to anodise the heatsinks to match the body of the ampifier or reduce contrast with the wood stain?
     
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  6. Zampotech

    Zampotech Friend

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    The estimated cost of the amplifier will probably be $340-$360

    I have already given these coolers for electroplating before. To be honest, it turned out badly, it turned out not a deep black color, but an incomprehensible brown.
    I was advised to change the technology to create an oxide film with further boiling in an aniline dye. Maybe everything will turn out well.
    Of course, the combination of black, silver and wood color hurts the eyes.
     
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  7. BobApelsin

    BobApelsin Rando

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    pcb was made and delivered half their estimated time .Now just knowledge of rest of components :)
    regards magnus
     
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  8. Zampotech

    Zampotech Friend

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    Schematic diagram of the amplifier with the nominal values of the elements. a little later I will give a picture of the arrangement of the elements. The amplifier needs a stable +24 power supply..30V/5A

    [​IMG]
     
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  9. joch

    joch Friend

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    This is madness! I want one just for its cute VU meter eyes!
     
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    Last edited: Mar 26, 2021
  10. Zampotech

    Zampotech Friend

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    For those who made this PCB, I publish the location of the elements.

    [​IMG]
     
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  11. Superexchanger

    Superexchanger Friend

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    Dropping by for the first time in a few months to acknowledge the elegant solution to the VU metering issue. Just superb.
     
  12. msommers

    msommers High on Epipens

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    +1 I'm in
     
  13. Sqveak

    Sqveak Friend

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    If this equates to joining a queue then I'm waiting in line.

    Sign me up for one magister speaker amp please!

    @Zampotech how many are you planning to make once your design graduates from prototype to production?
     

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