I purchased this amplifier around summer, but I am selling it now because I bought another one. The solder had deteriorated, so I had a professional repair it. According to the previous owner, it has been overhauled, and the electrolytic capacitors have been replaced. It's a single-ended amplifier using one 12AU6 vacuum tube and one 50C5 vacuum tube. It seems to have a very interesting configuration, different from the circuits using 6AV6, 6AR5, or 6AQ5, which are often found in small vacuum tube amplifiers of this era. It seems that the parts were selected and overhauled to revive the sound of that time. The exterior is in quite good condition, and since it has been overhauled, I believe it can be used without any problems. With old, transformerless overseas amplifiers, there is a risk of electric shock through the guitar if you connect the power plug with the wrong polarity. However, this amplifier does not have such a circuit. You can use it normally without any worries. Thank you for looking.