Just come across the schematic of MARANTZ 10B stereo FM tuner:
http://zilla.li/Resources/PDF/Marant..._Schematic.pdf
It has EC88 in cascode, six sets of three-pole Butterworth filters to replace conventional double tuned IF filters (see attachment) and CRT scope, Wow!!!!
The center LC element of the Butterworth has a shunt resistor to widen the bandwidth for FM stereo, I guess.