Hi everybody The manufacturer again offered to take a new amplifier NBM in exchange for my work. This is the last amplifier of the season. Then the company goes on vacation. If anyone is interested in buying this amplifier, I will take it, take a picture and test it. If necessary, you can change the supply voltage. Now he is at 220 volts. Its price is almost wholesale, $330+shipping. I hope that this amplifier will not be left without a new owner, and will not be covered with dust in the warehouse until September.