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An All-JFET Amplifier: Exploring Modern JFETs Circuits ...
https://audioxpress.com/article/an-all-jfet-amplifier-exploring-modern-jfets-circuits
Toshiba Semiconductors manufactured many junction field-effect transistors (JFETs) for audio applications: the 2SJ74/2SK170, the 2SJ103/2SK246, and the 2SJ104/2SK364 to name a few. Once production of these through-hole JFETs stopped, they became expensive. These original devices are difficult to source.
Simple JFET Audio Preamps - Ciphers By Ritter
http://www.ciphersbyritter.com/RADELECT/PREJFET/JFETPRE.HTM
JFETs also vary with respect to gain and noise level, so best operation requires some selection there as well. However, other than exceptionally bad noise in particular devices, a wide range of JFETs function surprisingly similarly. The input resistor R1 just drags the JFET gate to ground potential and so reverse-biases the FET. The value should be at least 10x the signal source …
JFETs: The New Frontier, Part 1 | audioXpress
https://audioxpress.com/article/JFETs-The-New-Frontier-Part-1
JFETs provide extremely high resolution, bringing out more details, sounding cleaner, clearer, and more natural than the best bipolar transistors such as the LM394, and even the best Telefunken tubes. Overall, I believe the JFETs offer the best sound in audio circuits.
JFETs and MOSFETs - sound-au.com
https://www.sound-au.com/articles/fet-applications.htm
However, MOSFETs can make very good audio switches if configured properly. Unfortunately, the range of available JFETs has shrunk alarmingly in the last few years. Most of the devices that were used for very low noise circuitry are no longer available, and those you can still get from major suppliers are far less useful than the 2SK170 and its ilk.
Audio Amplifiers - JFET - InterFET
https://www.interfet.com/audio-amplifiers/
Erno Borbely JFETS: THE NEW FRONTIER,PART 1
https://www.interfet.com/jfet-datasheets/audio-electronics-jfet-new-frontier1-2.pdf
medium level circuits. JFETs provide ex-tremely high resolution, bringing out more details, sounding cleaner, clearer, and more natural than the best bipolar transistors such as the LM394, and even the best Telefunken tubes. Overall, I be-lieve the JFETs offer the best sound in audio circuits. I have been working with JFETs since
Linear JFET Amplification/Audio Excellence | All About ...
https://forum.allaboutcircuits.com/threads/linear-jfet-amplification-audio-excellence.183334/
Here's the same graph from the datasheet of a real FET. It's an ON-Semi 2SK3557, which is a particularly good audio FET. The top-right graph is the one that matches the one in your book. The ratio between drain current and gate voltage is called Gfs, the forward transconductance. It would be nice to think that it is constant, but it isn't.
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