This website is reader supported. When you purchase items on eBay through the links on this site, we may earn an affiliate commission at no cost to you. Read our Privacy Policy for info.

Roland Rhythm 33

“Vintage 1972 TR-33 Rhythm Machine by Roland. In good condition given its age. Please see pictures. I have taken close ups of any nics I see.

Will send a link to a 26-page manual that includes schematics with purchased item. Also had an 1/4 stereo plug output and potentiometer output for volume at the rear. The TR-33 is a drum machine analog transistor (TR = Transistor Rhythm).

Has sounds such as bass drum, cow bells, bass drum, congas, claves, rimshot and more. It uses a circuit “resonance granted” (Tuned Resonance). Through modulation of a white noise generator, it has sounds like the snare, high hat, maracas and cymbals.

The TR-33 and it’s sisters, the TR-55 and TR-77 were the first products of their brand. The TR-33 was initially designed to be mounted under the keyboard of an organ or piano; hence the “L” shape. ” Click here to visit listing on eBay