The chances are good that solid state amps generally speaking will make the LS3/5As sound rather sterile and dry whereas low to medium power tube amplifiers will make them sound full bodied, natural and musical. Allow tube amps to warm up at least one hour before listening critically.
They only handle about 35 watts. This is part of the reason that they were 15 ohms as transistor amps have a harder time damagin them, and also tend to sound smoother than if the speaker were 8 ohms.
And as others have mentioned, they were really well with tubes.
They are one of the first examples of the 'near-field' listening concept, as the only thing between them and the listener was often a studio mixing console.
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