ATK - wiring diagram to add active/passive switch?

[pkmoor]

Thanks to the recent blowout on the ATK's I have one coming my way. Does anyone have a diagram to add a passive/active switch to it?

 

[line6man]

Does it have a 250K/500K volume(s) running before the input of the preamp, or a 25K volume after the preamp?

If the latter, you will need to switch to a higher pot value running before the preamp, otherwise you will lose most of your output/treble in passive mode trying to feed a high impedance signal through such a low resistance pot.

Assuming you have the right volume pot setup, you should be able to just add in this switch, provided the preamp and controls are not PCB mounted or something.

 

[Joe Nerve]

Guess I might want this also.

 

[pkmoor]

Does it have a 250K/500K volume(s) running before the input of the preamp, or a 25K volume after the preamp?

If the latter, you will need to switch to a higher pot value running before the preamp, otherwise you will lose most of your output/treble in passive mode trying to feed a high impedance signal through such a low resistance pot.

Assuming you have the right volume pot setup, you should be able to just add in this switch, provided the preamp and controls are not PCB mounted or something.

I think this is the wiring for the current model