Thank you very much for viewing! This is a listing for the "HEX E828 HARMONIC EXCITER". Likely manufactured in 1982, based on the power cord. The simple circuit board and terminals have been cleaned and treated with a cleaner. Initially, there was crackling in the FREQ knob and output, but it has settled down now. (However, since it is very old, crackling may reappear.) It emphasizes harmonics, giving it a punchy sound, allowing you to create sounds with a glossy feel and sharp attacks. It produces a groovy, exciting sound, and I used to combine it with things like a ROCKMAN to do things like "that person". Also, it improves clarity, making it less likely to get buried in an ensemble. There's definitely a unique tone that only this can produce. Here is an excerpt from the manufacturer's catalog at the time. Please refer to it. https://guitar-catalog.com/effector/pmp/198x/jp_index.html This is a used item. There are scratches and paint剥がれ (peeling) due to use. Please understand and agree to this before purchasing. Those seeking perfection or who are overly concerned about details, please refrain from purchasing. To prevent swapping, returns are not accepted. I have checked carefully, but there may be oversights. Please feel free to message me with any questions about the condition. Also, there are people who ask various questions after purchasing, so please contact me before purchasing. We want to have a smooth transaction, so thank you for your cooperation. Please refrain from things like "write the product ID on the exterior" or "delayed receipt evaluation notification" after purchase. Please be sure to contact me about such matters before purchasing. We may cancel the transaction depending on the situation. Please provide a receipt evaluation within 2 days. Please do not leave it unattended after receiving the item. Please contact me if it will take time to contact me.