As Kory says, 12-volt systems operate from a battery, which is always DC.
One thing to consider is the converter installed in your TM. In more or less the time frame you are talking about, TM used converters from Magnetek, aka Parallax As I recall, the model numbers were in the 6300 or 7300 series. These early converters had a couple of issues. One of them was that the DC output - the one that powers most of the circuits in the TM, including lights - was unfiltered. Short but significant over-voltages were common. Incandescent lights don't care about these short transients, but LEDs are (or were) sensitive to them. Early burnout of LEDs was a common result.
If you don't have a Magnetek or Parallax converter, it is not an issue. And it is possible that LEDs are over-voltage-protected these days - early ones were not.
Just something to think about.
Bill
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