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Permalink Reply by The Phrygian Kid on June 11, 2015 at 7:18pm

I think you ought consider putting the preamp at a different point in the circuit, between the piezo and the switch so that it amplifies the piezo only.

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Permalink Reply by Preston J. Laisure on June 12, 2015 at 4:46pm

That's a interesting idea. I'll certainly keep that in mind. The question was concerning the use of 2.5mm mono plugs  combined with 2.5 stereo jocks.  Must I combine both lines out to continue the strongest mono signal possible?  Since the stereo jack was designed to send two separate signals.  The best solution that I can come up with is just hard wire as I always have.  Thanks.  Preston

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Permalink Reply by The Phrygian Kid on June 12, 2015 at 6:31pm

The 'ring' (middle) conductor will be shorted to ground in a mono plug, so don't even worry about it

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Permalink Reply by sparky37 on July 20, 2015 at 3:22pm

I ordered mono 1/8" solder male and female jacks from mcm electronics in packets of 10 each.  http://us1.activepoint.com/MCMelectronicsC57/slider.html?page=625   The output of the preamp is only mono. I believe the output of the uk 2000 preamp also has a switch to turn on and off the preamp, hence the the third connection on the jack. When you plug in the 1/4" mono output jack it turns on the preamp when you unplug it turns off the preamp. Because of this using the preamp output as one of the inputs to a three way switch could be a problem. If you bypass the output third connection how would you turn on or off the preamp?  I used C. B. Gitty's rail runner bridge and piezo pickup plugs right in to the input on the UK 2000 pre amp works great, but got to have lots of string pressure down on the bridge.

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