Ampeg Mercury M-20 Tube amp sounds amazing, loud and has a great break up tube tone breaks up nice. Has wear and tear, has some oxidation on control plate. The foot switch works but is just a small push button.. Pro serviced, amazing tone amazing Tremelo , Great amp ready to go... The item "VINTAGE AMPEG MERCURY M-12A TUBE AMPLIFIER GUITAR AMP SPEAKER" is in sale since Friday, November 23, 2018. This item is in the category "Musical Instruments & Gear\Guitars & Basses\Guitar Amplifiers". The seller is "tommymang21" and is located in Buffalo, New York. This item can be shipped worldwide.