more power for J5

    Hi all,
    I'm goin' to order a J5 kit and would like to know if it is possible to increase the power of the amp? Putting two EL84 instead of one? Many modifications?

    Thanks.

    R.

    Re:more power for J5

    yes, you may add another EL84, but not in parrallel (the current would be too high for the OT). You can add another EL84 in a self split configuration and will get about 8W then. This is a pretty easy modification, it's only the tube, some wire and some resistors.
    Regards, Martin

    Re:more power for J5

    Hello,

    Martin:
    Can you give a little explanation how this is achieved. Maybe it would be aa topic for the J5MMk1 FAQ.

    Greetings,

    madampfan

    Re: more power for J5

    Zitat von Tio Pepe


    Hello Martin.
    What do you mean esactly for "self split"?
    There is a diagram for this added tube?
    I'm interesting too!!

    Self-split is a push-pull poweramp without a phase-splitter. Instead of feeding one of the power tubes with an inverted signal, that input is grounded. This gives about half the power of a regular push-pull poweramp.

    Checkout the Firefly amp at http://www.ax84.com. It has a self-split poweramp with a dual triode (12AU7) as powertube.

    Re: more power for J5

    Hi.
    I've read something about this self-split wiring.
    To achieve this on my J5 I have to connect the pin9 of both EL84 to OT, then the CT to the power supply (310v).
    The pin 2 of one EL84 to the signal and the pin2 of other tube to the ground. Then both the cathode in series with a resistor, to ground.
    Now:
    1) will change the primary impedence of OT?
    2) which value I have to give to EL84 cathode resistor?
    Thanks

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