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Hi Tom,
Saw this discussion and did some research. First, it seems that with this circuit, as with many alternate versions of FET based bass pre-amps, the potentiometer is 50K. It should be of the linear-taper kind. Second, the alternate versions indicate that the pre-amp should be in the signal path AFTER any pickup selector switches, and volume/tone pots.
I have attached on link to a schematic & description that gives some useful help:
http://www.till.com/articles/GuitarPreamp/index.html
On a side note, I am currently working on a series of overdrive pedal circuits...as well as continuing with my 1/2 watt amplifier circuits. These are lots of fun, and bridge the time-gap when waiting for glue to dry.
I should add that there are likely, other applications of the circuit in question, where the pre-amp receives the piezo signal, and then sends that through the vol/tone pots, and then out to the output jack. Experimentation is always a good idea to see what results suit your ear best.
While logarithmic pots are used for the volume controls of a guitar (reason is that humans perceive audio volume in logarithmic form), using a linear taper pot for the pre-amp control allows for a more precise and proportional variable resistance of the pre-amp signal. The more precise, the more easily one can fine-tune the response in the preamp.
The link I had mentioned earlier had a lengthy discussion thread about the Tillman circuit, and its variations. But at no time did any of the participants mention if they were using a rod piezo or a disk (but I believe it was the former). I imagine each of those piezos has a different influence on how the Tillman reacts and operates.
But in the bigger picture, it really comes down to what works/sounds best to you. Why not test each theory in your specific application to see?
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