Re: Capacitors. Is physical size important?
Modern electrolytics are vastly better than their predecessors: it's all about internal chemistry. I have no problems fitting physically-smaller but electrically-equivalent modern ones in place of older bulkier items.
Some may worry about heat buildup in physically smaller ones: my way of thinking is that heat buildup from within the capacitor is due to the thing being inefficient [it has internal-resistance] and modern capacitors generally have lower internal-resistance (that chemistry-thing again) so they should heat less than older ones.
If a modern 'can' capacitor is smaller so ends up loose in its clamp I've used a length of plastic waste-pipe with a slit cut down the side as a packer.
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