Multi-amp guitar rigs
There are three classic guitar amplifier circuits that most amplifiers are based on that all use different power amplifier tubes: The EL84 powered class A circuits which comes from the Vox AC30 and AC15 amplifiers , The 6L6 and 6V6 powered class AB circuits which come from Fender amplifiers , and the EL34 powered class AB circuits which come from Marshall amplifiers . 
<triplet> Vox AC30 <subj> EL84 <obj> uses