Marshall Amps - Valve vs. Solid State comparison by The Clans Craig McDonald

Which is better - valves or solid-state? Can youreally hear the difference? The Clans Craig McDonald compares the sound of Marshall guitar amps - the classic JTM30 valve amp and the solid-state MG50DFX.\r
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Guitar - 1978 Fender Stratocaster - Seymour Duncan Hot Rails.