Can somebody tell me what "preamps" and "power amps" are? And how they are related to tubes.
Preamp takes the powerless signal from your guitar and makes it a useable signal, but still low power. The power amp makes the signal the correct power for the speakers. Straight out of the guitar the signal can't power anything. Straight out of the preamp the signal could probably power small speakers like headphones. Power amp gives it the oomph.
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Unless its electronic drums.