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The original Zenith cobramatic changers did NOT have turnover cartridges. The first year models 1948 were 78 RPM only, and later models that had 33RPM had a single stylus that was a compromise tip size part way between LP and 78. The Zenith designed cobra pickup was originally a variable capacitance cartridge that FM modulated an oscillator tube that was demodulator for audio. None of these cartridges supported multiple styli. Zenith kept this scheme until the mid to late 50s then they switched to generic third-party ceramic turnover cartridges, but perplexingly kept using the cobramatic name and tone arm design for a while after the switch.
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