I don't see anything wrong with adding an auxiliary input by soldering a phono jack cable through a cap to the volume control on a radio if someone who knows what they're doing does it, and it's a power transformer type set. If that's what somebody wants that's fine with me, it does not hurt the radio...the attatchment can be disconnected if desired.
Now on an Atwater Kent it would be more difficult to add an auxiliary input as its volume control is in the RF circuit and varies the RF gain, also the audio stages are lower in gain. It probably wouldn't work well in this case, but would in a slightly more modern superhetrodyne set.
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