Re: FET amplifier information biasing voltage and circuits etc
It's from the 1977 National Semiconductor FET Databook.
It does still seem to be available as a pdf online, but the pdf quality may vary.
See below for process 52. The J201 was the original device used in the guitar project and you can see it listed on the screenshot below as a process 52 device.
The FET databook has quite a few app notes at the end. There's some good stuff about noise in chapter 6 including app notes about cartridges and noise. Also, some noise comparisons for various process types as in the image below.
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Regards, Jeremy G0HZU
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