Heathkit AA-50 Stereo Integrated PP 7591 Amp. See all pictures for cosmetic description. The item "Heathkit AA-50 Stereo Tube Integrated Amp Needs Tubes" is in sale since Monday, September 6, 2021. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps". The seller is "circatubes" and is located in Northampton, Massachusetts. This item can be shipped worldwide.