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Reply to "Lionel 8142-T35 sound board(SOS) repair"

Virtually all the caps you run across in model train stuff will be aluminum.  Tantalum are for situations where you need higher capacitance in smaller spaces and wider operating temperature ranges.  They will be considerably more expensive than aluminum for the same ratings.  I used a lot of these in aerospace applications, space was at a premium in panel mounted instruments.

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