This is an excellent illustration of the damage that can be done by an over-driven amplifier... Looking at the first spectrum analyzer photo, you see the KNLC signal peaking above the noise floor by at least 10 dB... In the second analyzer photo, the added noise and distortion products of the 'fringe amplifier' come close to completely obscuring all of the KNLC signal. KMOV and other signals illustrate the same problem.
Amplification is not a cure all.
Thanks for posting this ADTech