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dual triode - single, parallel, series switch

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  • dual triode - single, parallel, series switch

    first of all, thanks to everyone here that i learn't from as i built and messed with my 5e3.

    i have changed it to a single channel amp and would like to use a rotary switch on the first 12ay7/12ax7 to go from - single triode, parallel and series operation.
    my stumbling block is what to do with the unused triode when in single mode.
    do i need to ground the grid like the standard imput jacks do?
    disconnect the grid?
    disconnect the plate?
    disconnect the b+ supply?

    i intend to separate the cathodes (i presume i have to)

    if someone could point me towards a schematic that switches a triode in or out of the circuit like this i would appreciate it.

    cheers

    by the way, whats the difference between cascade and cascode?

  • #2
    triode switch

    Ground the grid when not using the triode.
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