Quote:
Originally Posted by Jeffhs
How long did Zenith use PTOs (permeability tuned oscillators) in their radios? I have three such radios with just this type of tuning system (no variable capacitor for FM, but there is a small variable cap for AM). I read here in VK that the company was using PTOs as late as the K-731 series in the late '50s until about 1965.
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IIRC, from the very beginning of Zenith AM-FM table radios, at least the tube sets. Post-war to the "X" models.
