There are 4x old USA made tube installed and they are all biased correctly thanks to the individual bias. The remaining tubes are new production 12ax7. It is a 60 years old electronic after all. You're welcome to come ear it play in person if you're around. The item "Sherwood S-5500 II Tube Integrated Amplifier" is in sale since Thursday, July 30, 2020.
This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps". The seller is "japan_ganymede" and is located in New York, New York. This item can be shipped worldwide.