18 Watt lite

Discussion in 'The Workbench' started by Marcell, Aug 4, 2020.

  1. Marcell

    Marcell Active Member

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    Is this a good beginner ampproject? Looks easy. Parts are not that expensive.
     

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  2. Guitar-Rocker

    Guitar-Rocker Well-Known Member

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  3. neikeel

    neikeel Well-Known Member

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    Absolutely.
    May I suggest the split cathode (cascaded with TMB) it is a fantastic little amp note the tweakers table too:
    [​IMG]
    [​IMG]
    You can build with or without a tube rectifier.
     
  4. Marcell

    Marcell Active Member

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    I was thinking both rectifiers.. tube and diode. On off On toggleswitch. Just playing with the options.
     
  5. neikeel

    neikeel Well-Known Member

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    I did a ptp version recently in an old Elpico amp. Perfect as it had two EL84s an EZ81 and two ECC83s. I made mine with the RS EL84 OT and hi/lo input jacks. It has TMB as per the diagram. I used 100k plates and 820R on v1 cathode - it does not need any more gain or crunch IMO.
    Amazes me how much gain you can get with just two triodes and a cathode follower and a pi.
     
  6. jchrisf

    jchrisf Well-Known Member

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    I'm just getting started researching the 18 watt amps but found this and thought you might find it useful. I didn't even know what the Lite II was until you posted this and then I found the link below
    https://www.18watt.com/viewtopic.php?f=25&t=24431
     
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  7. neikeel

    neikeel Well-Known Member

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    I've been on 18w a long time but rarely go there, some decent people there although some odd things happened a while ago, there was a slightly paranoid feel at the time. Seems ok now.
    I found the proper schem.
    This sounds like a Marshall with lots of oomph on tap. This has classical 2k7/0.68uF with 100k plate and 0.01uF with 500pF/470k treble peaker. As I said my inputs have hi and lo (like a 2203/2204).
    If you are after a simple 18w I cannot recommend it too highly.
    [​IMG]
     
  8. South Park

    South Park Well-Known Member

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    The schematic looks a lot like a 2204 with the cathode Follower removed . You need a wire lay out to build this . If I would build this I would use the 2204 preamp with the el 84 power tubes. Not all schematics online are proven you want stuff that has Ben built by amp builders
     
  9. neikeel

    neikeel Well-Known Member

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    [​IMG]
    Although not paint by numbers this gives you the basic layout. If you build it I can give you specific tweaks that I made that all gel. Failing that I can write out a full schem.

    I've built it and it works well. Take a look. The cathode follower tone stack is there!
    Admittedly I had very little space so went PTP. I'll post some pics when I have time at the weekend. Maybe even some clips:hmm:
     
    Last edited: Aug 5, 2020
  10. South Park

    South Park Well-Known Member

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    It is a nice And easy high gain circuit to build . El84S are A great sounding tube when over driven . It is good you have a wire layout To go with the schematic . The whole Thing is close to a 2204 .
     

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