Amazon.com: UpBright 9V AC/DC Adapter Compatible with Zvex Vextron Distortron Box of Metal Fuzz Factory Super Duper 2-in-1 Vexter Instant Lo-Fi Junky Fuzz Probe Vextron Series Mastotron Box of Rock Power Charger
zvex mastotron | TalkBass.com
Boss SL-2 and ZVEX Mastotron in the Superego Plus effects loop, any other ideas? More details in comments. : r/guitarpedals