Maxon DM500 Digital Delay. This is a rack-type digital delay from the 80s and 90s. 【Condition】 ・The power switch shaft is broken, and the switch button is detached. ・Therefore, the power is always on, and the power ON/OFF needs to be controlled with a power strip, etc. ・The exterior has scratches and dirt commensurate with its age (please check the photos). 【Operation Check】 ・Delay sound output and basic operation of each control were confirmed without problems. ・The INPUT VOLUME PULL MIC did not show any change in input level when pulled. ・FEEDBACK PULL INVERT sound output has been confirmed, but the presence or absence of phase inversion has not been confirmed. ・INVERT-MIX output jack sound output has been confirmed, but the presence or absence of phase inversion has not been confirmed. ・Footswitch jack has not been confirmed due to lack of compatible equipment. There were no other problems with the input/output, knob operation, or effect operation. There are no manuals or accessories. The unit only. Recommended for those who understand the current condition and the issues, and for those who intend to repair/maintain it, or use it with a power strip. Due to the age of the equipment, please purchase only if you understand the condition.