Modify for EQ on/off switch – Alice 828 MK1

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Home Forums Ask Ted Modify for EQ on/off switch – Alice 828 MK1

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  • #16431
    WHoops
    Participant

    Hello Ted,

    how are you? Wish you well

    I have an Alice 828 MK1 and would like to modify it  so that I would be able to have a switch to turn the EQ on/off like in the MK2, stock the MK1 has the EQ always on the channels.

    Is it possible to modify the MK1 to have an On/off switch on the EQ? if so where do you advise on the schematic to cut the connections for the switch

    Thank you so much

    T

     

    #16916
    Ted Fletcher
    Keymaster

    It would be possible to add an EQ in/out switch, but there may be problems with levels.
    The top of the channel fader is fed by a 100uF cap. Switching the input of that from the output of the input amplifier should do the job, but I would advise against it because of probably unforseen level and stability problems.
    If anyone asks me to carry out that mod, the answer would be no!

    #16917
    Ted Fletcher
    Keymaster

    Here is the circuit diagram.

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    #30449
    ilcaccillo
    Participant

    Hi Ted,

    I also own a 828 MK1 mixer, and I would love to have an useful ON/OFF switch for the EQ section like Whoops asked.

    I can see that in your new 828 mixer the MK3 that is based on the MK1 circuitry , you included a really useful ON/OFF switch for the EQ section.

    Although you advised in the past of not performing this mod on an MK1, you probably found a clever way of including the ON/OFF switch without incurring into the “Level and Stability” problems you mentioned before.

    I would like to ask you if you please could help me out on how could I modify my MK1 to include an On/OFF switch in the EQ as it’s implemented on the MK3 mixer?

    Thank you so much for your work Ted and for all your Kind help

    Best Regards

    #30645
    ilcaccillo
    Participant

    Hello Ted,

    How are you?

    Any chance you had some time to read my last reply?

    Thank you so much

    My best regards

    #30658
    Ted Fletcher
    Keymaster

    Hi Ilcaccillo,
    There’s a lot going on!
    The way I changed the circuitry on the Mk3 828 to include an on/off switch was by adding a further buffer stage immeiately before the channel fader, this made the mod possible but it’s not really a practical proposition on an existing Mk1 mixer, bearing in mind that the mixer is now very old and the mod requires a great deal of work.

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