I have a Marantz tuner with simple ceramic filters, and I replaced them with those linear phase LC blocks (on a small PCB with some additional circuitry). Linear phase in FM domain is amplitude linearity in the audio domain. The linear phase filters were also available in electronic parts shops over here. Here is some description and pictures (sorry it is Hungarian only):Īnd the full circuit diagram, it is possible to get some ideas from it: The result was an ugly monster that is still the reference of many fellow-countrymen of mine. The designers incorporated every advanced circuit solutions of that time (discrete MOS-FET front end, TOKO linear-phase LC IF filters, LC phase discriminator FM demodulation, LC multiplex filters, etc). There used to be an ambitious product in the early 80's by the late Orion radio factory in Hungary, the ST-240 AM/FM tuner.
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