![]() This voltage gain prepares the signal of your guitar to go into this blue section, which is the power amp. Whatever your amp has, that's where it exists. ![]() The preamplifier section usually includes an EQ: bass, mid, treble, etc. The guitar sends a signal into the first section of your tube amp called the preamplifier section, and this amplifies voltage gain. Basically, the yellow square in the upper righthand corner is your guitar.
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