All of the tubes are old school vintage American tubes. Each amplifier has three 5R4 rectifer tubes, one 6SN7, one 6N7 and four 6L6GC output tubes. Each amplifier weighs 35 pounds.
I tested these amps on my bench with a signal generator and I took pictures of their very clean output signals on my Tektronix scope. I measured almost 25 volts on my test load of 8 ohms without any distortion. That is more than 70 watts RMS for each amplifier. I also listened to music with these amps for several hours using my stereo speakers and they were very nice sounding with impressive bass. So this is a really nice pair of powerful old school tube monoblocks.They are in plug and play condition and you will not be disappointed. I will package them up properly so that you receive them in good condition. Please don't hesitate to ask me any questions you may have. The item "Stromberg-carlson Ap-55 Monoblock tube amps" is in sale since Wednesday, January 29, 2020. This item is in the category "Consumer Electronics\Vintage Electronics\Vintage Audio & Video\Vintage Amplifiers & Tube Amps". The seller is "karnielso_9" and is located in Kanata, Ontario. This item can be shipped to Canada, United States.