The impedance knob has been removed, but can be adjusted. There is a large amount of play in the speaker terminals. (Tracking numbers are not available in some areas). Thank you for your understanding. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps".The seller is "waiyorozu-shop" and is located in this country: JP. This item can be shipped worldwide.