Hi everyone.

I'm building a bass ukelele (the kind with rubber strings). I have chosen a rod piezo under the saddle. I want to add a a Tillman preamp plus a tone and volume pot set up to get the most out of this classically upright bass sounding instrument.

Should I wire the preamp in BEFORE the tone and volume of after?

What values do you suggest for the pots and tone cap?

I read a lot of conflicting information on these specs... 25k-500k pot values is a pretty big range!

I'd really appreciate some practical advice. Thanks.

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Replies to This Discussion

Hi Tom,  A piezo pickup puts out more signal than a magnetic pickup.  As the Tillman preamp has a gain of approx x3, you may find it distorts early.  Having said that I would put the vol and tone controls after the preamp.. A piezo pickup has a very high capacitive output impedance in the order of 10Mohms so your pots will be of that order to work before the preamp.  

I recently built a bass uke from a child's guitar about 3/4 size but used a preamp/pickup with 4 band equaliser from eBay like this one http://www.ebay.co.uk/itm/4-Band-EQ-Equalizer-Piezo-Pickup-EQ-7545R... .  This works very well and I have even gigged with it using a homemade amplifier and 8" speaker in a small flightcase.

If you need any help let me know  

Regards  Tony.

Thanks Tony.

Yeah, I have pretty much decided to put the pre amp before the tone and volume. Unfortunately, in terms of that kind of equalizer, I'm making a solid body bass so there is no room. I'm going for a good tone control instead.

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