In the FM pto vs tuning cap debate, I don't believe that there was a clear winner... tuning caps were indeed used in many very high quality tube type FM tuners. For example here is a description of the tuning cap used in the Marantz 10b, considered by many to finest tube type FM tuner ever designed:
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The tuning capacitor was a Hammarlund 8 gang, silver plated, push pull design. It balances out circulating currents and minimizes cross coupling between stages. It also cuts down on common mode feedback. It is calibrated at ten different points. It is also designed to make the radio dial linear. It is the most expensive part in the tuner and you couldn't afford it today.
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https://forum.audiogon.com/discussio...und-so-amazing
jr
02-24-2016, 05:16 PM
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