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Technically I'd call yours a hot chassis set.
If there is not a power transformer in a set it becomes a hot chassis in my book. Some hot chassis were "hotter" than others. The worst have direct conections between the power cord and the chassis, and the less dangerous but still somewhat unsafe ones had an indirect connection to ground through a resistor and or a capacitor.
I'd hook up the external audio input source to the junction of R6 and R7 and the ground of the audio source to the junction of R7 and R8(going by the part numbers in the first link). This should allow you to use the sets origional volume control, but for safety sakes I reccomend either using an audio source that does not plug into the wall, or powering the Zenith through an isolation transformer.
Hope this helps.
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