I never needed pre amps on any of my guitar and vocal amplifiers i had during 35 years of semi-pro work....Everything was built into the Amps...It was simply plug into the mains supply, shove a microphone into the mic socket, then finally switch on the amp Steve...Simples Cousin Cobber...Dont try telling a duck how to swimyou cant just amplify a very low level signal as you need a preamplifier stage to amplify before you big amp can amp it up more as your amp may only amp certain signals above a threshold uncle time flipper than below


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