Posts by Tiago

    Re: Kit for Tube-preamp stompbox ?


    Hello!
    Based on my experience of building these kind of things, here is my opinion:
    -Two channel Clean/Dirt
    -Some voicing switchs like high/low, countour,etc.
    -It would need only one tone stack (in order to keep things simple) but independent volumes are very important
    -Maybe two versions, one pedal and one rack, both of them should have lots of spare space for upgrades
    -Rack version with remote switching (relay) and the pedal one of course, switch on the chassis. Or maybe the relay switching could be an optional add-on for both
    -Power supply internal of course with a small toroidal transformer, otherwise only a switching PS can be used but thats not practical at all. (I don't even consider 12V operation) ;(
    -Stereo operation is more 80s fashion (don't get me wrong, the 80s were great for guitars, but not for some little things) than useful. And most effects processors can get a mono input and the output in stereo.
    -Speaker simulation would be cool but no necessary, maybe as an optional add-on (if one consider the Marshall incorporated in the JMP1).
    -Option between true-bypass and buffered bypass should be left for the builder by connectiong things differently by with (almost) the same parts.
    -A must will be an level type selector for the output, to select between line level and guitar level signal (1Vrms and 100mVrms)
    -If only two tubes are used, (4 triodes are required to get a standard high gain dist) it should use a solidstate output buffer.


    Some of my options are made looking for prices and simplicity. To keep the price low it could be done some other things. By taking some of the funcions and making them as "optional" upgrades. In the rack version by using the same case with the same layout as the Mad Bass preamp (layout due to the vents for the tubes), bigger quantities, lower prices. The same power supply PCB as the bass preamp, and maybe making this preamp on a pcb with some extra pads for mods in place of a terminal board.


    I never bought a amp/pedal kit, I usually make them from scratch but if the price range goes under 100€ (its a hard goal, but not impossible), I will get one as sone as I can.


    Regards from Portugal!
    Tiago Pires.