Latest update of the Low Tim Amplifier, claimed to be a very good sounding design.
http://users.ece.gatech.edu/~mleach/lowtim/
used the same type of N-channel FET as the output transistor. With an N-channel FET the current generator and the output transistor will have the same characteristics according to thermal behavior and distortion.
http://www.tanker.se/lidstrom/eng/zeni.htm
EDN-Design Ideas
http://www.edn.com/archives/1995/120795/25di2.htm
Amplitude limiters are necessary in many systems, such as radar and FM receivers, for which the system cannot allow the amplitude of the signal to exceed the given positive, negative, or both limits.--Scroll for the article.
http://www.edn.com/archives/1998/060498/12di.pdf
Limiting amplifiers provide gain and level shifting and keep the input voltage within a safe range for TTL-compatible (a) and ECL-compatible (b) A/D converters.
http://www.edn.com/archives/1996/090296/18di3.htm
Designed for 2304, 3456, 5760, and 10368 MHz using the ATF-36077 PHEMT.
http://www.ve1alq.com/downloads/preamps/mw97lna1.html
http://www.reconnsworld.com/audio_cartridgeamp.html
This tube headphone amplifier kit manual has building instructions and full circuit diagram of this device.
http://hollowstate.netfirms.com/epluskitmanual.pdf
Three of these amplifiers are used in series to build the 455 kHz IF amplifier. AGC voltage comes from the AGC Circuit
http://www.pan-tex.net/usr/r/receivers/secifamp.htm
A tutorial by Ian C. Purdie demonstrating negative feedback, a.k.a. emitter degeneration.
http://www.electronics-tutorials.com/amplifiers/negative-feedback.htm