|  All-Tube Guitar Combo Amps use an analog tube valve for the preamp and a tube for the power amp section, producing the warmest and richest tones you can get out of a guitar amp.
Fully tube amps usually use 12AX7 or similar tubes for the preamp, and larger EL84 tubes or 6L6 tubes for the main power amplification section.
Tube amps cost a bit more than their solid state or hybrid counterparts, but they are the standard equipment of professional guitarists.
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