I am the original owner of this excellent integrated amplifier. I purchased this new A stock from an authorized Yamaha dealer along with a lower power tube integrated to mate with high efficiency horns. Quite frankly this is an amazing amplifier but tubes and horns are just a natural mate. The amp has certainly seen less than 100 hours and has beautiful meters a la McIntosh. Build quality is off the charts at this price point. See my feedback and buy with confidence. The amp is 3 months old and is priced at a zero loss “no brainer” price.