New 18+ Peavey Acoustic Guitar Amp. Peavey solo guitar amp guitar combo amp. Amp is in great condition. Bought for use as a practice amp, satisfies all my needs, better than i expected to get for the money, lightweight, great sound, good price and fast response from seller. A guitar amp by peavey can come in many different forms, and this can include solid state tube amps, tube amps, modelling amps and hybrid amps.