Piggy-backed FET buffer?

[Ben N]

I have searched and have not found anything about this:  What I am shooting for is a higher Z input buffer on FET-switched pedals, like Ibanez Soundtanks.  I thought about subbing a JFET for the BJT input buffer, but am afraid the high output impedance will screw with the FET switch after it.  So how about just piggybacking two JFETs--would that get you the big input Z but with acceptably low output Z?

Ben

[TheBigMan]

http://aronnelson.com/gallery/TheBigMan-Layouts/fetbuffer

Cascading two buffers is also much simpler than rebuilding the existing buffer.  Finding a FET that'll map to the the ECB pinout of a 2SC1815 without bending the pins won't be easy.

[Ben N]

Thanks.  Yes, the add-on buffer would do the job.  I was also aware of the pinout issue, but if I am adding a board anyway, then I could just wire a daughter board to the holes from the existing buffer.  But it does add a stage (small amounts of distortion and noise, which are about to have the bejesus boosted out of them by the following 4 gain stages), which I would rather not do.  So, having saved that very useful layout, I am still wondering if anyone has anything to say on the idea of just stacking JFETs.