It's a myth that tubes 'sound' different they don't produce sound as such. but they do react differently in your amp causing IT to sound different. That relationship is better explained here...
Why Power Tubes Sound Different
So in other words, its NOT myth that different power tube designs make your amp sound different.
Sorry, what was your point? Tubes dont transmit sound, neither do transistors, but they affect how the circuit alters your guitar tone.
So.... they effectively DO have a sound.
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