Ampeg V4 Guitar Amplifier Vintage Amp V4. Vintage ampeg v-4 guitar amplifier. One of the loudest amps in history is the ampeg v-4, known for it’s clean tone at blistering volumes. Functionally and electrically, it is in 100% working order. Cosmetically, it is in excellent condition with no rips in the tolex and some minor scratches on back paint. The reverb knob looks like it was changed at some point in it’s life. Other than this, all si original including the 7027 power amp tubes, which give great tone!Can sound like a vintage marshall or fender, truly a versatile amp. Ampeg v4 guitar amplifier vintage amp v4 guitar amplifiers. For more details and information about this great vintage amplifier, goto. A copy of the original owners manual is also available fro download on this site. This is a very heavy amp, around 60 lbs unpacked.