★★★Year-End Sale!★★★ Limited time offer! Get it at a reduced price. Don't miss this opportunity! ★★★★★★★★★★★★ This is a power amplifier made by AY Electronics in Takatsuki City, Osaka Prefecture. Purchased over a decade ago. I've used it for many years, but I'm selling it due to a system upgrade. Class D and digital amplifiers are the mainstream these days, but this is a gem from a domestic manufacturer that designed and manufactured a discrete amplifier, and at a low price. I visited the manufacturer several times and received assistance from the president (founder) with product selection and custom modifications. Regarding the custom modifications, the gain was slightly reduced to match my beloved preamplifier. It seems to be designed with a passive preamplifier (attenuator) connected in the front end. Therefore, the gain value is not the one stated in the product details (extracted from the web). Personally, I think the sound has improved. (Note) There is a red ring on the + (positive) speaker terminal, but there is no black ring on the - (negative) terminal. Returns are not accepted.