Looking for a vintage tube amp with serious character? This is a rare, USA-made DOD GRIND IT combo guitar amp from the late 1990s. ? Perfect for. Collectors of rare 90s guitar gear. Fans of DOD distortion tones from the golden era of rock and grunge. Players wanting a small practice amp that gets loud with killer tone? Features. Integrated Tube Technology w/ EHO circuit. Clean & Overdrive channels. 8 built-in speaker – compact yet powerful. Dual distortion voicings – get that gritty 90s sound. True Made in USA quality Specs Recap. Brand: DOD. Model: GRIND IT. Category: Guitar Combo Amp / Small Amp. Year: 1997. Origin: Made in the USA.